Questions on Geometry: Circles and their properties answered by real tutors!

Tutors Answer Your Questions about Circles (FREE)

Question 319760: The area of a circle is 30in2. If you triple the circle’s radius, what will its new area be?
Click here to see answer by mananth(12270)

Question 319920: If a circle has an area of 94.99 cm2, what is the length of the radius?
Click here to see answer by checkley77(12569)

Question 319920: If a circle has an area of 94.99 cm2, what is the length of the radius?
Click here to see answer by ankor@dixie-net.com(15656)

Question 320230: andy would like to put a row of decorative tile around his circular pole. the radius of a pole is 5 feet. if the tile cost 12 dollars per foot how much will the tile cost?
Click here to see answer by checkley77(12569)

Question 320470: draw the outer circle of raius 3cm.then draw six identical smaller circles touches it neighbours and the outer circle?what is the radius of the circle that will fit in the central hole?
Click here to see answer by Fombitz(13828)

Question 320791: When the radius of a circle is multipled by 4, the area of the new circle is 40 in3. What was the area of the original circle?
Click here to see answer by Alan3354(30993)

Question 320791: When the radius of a circle is multipled by 4, the area of the new circle is 40 in3. What was the area of the original circle?
Click here to see answer by solver91311(16897)

Question 321270: I have a circle whose radius increases 2.2' per hour, starting from 0. I have determined that the area of the circle is 60.82' sq after 2 hrs. How do I represent the area as a function of time???
Click here to see answer by Alan3354(30993)

Question 321286: I have a tanker that is sitting 450 ft from shore, is leaking oil that is advancing in a circle at 2.2 ft per hour. If it takes 204.55 hrs for the oil to reach the shoreline, how long will it take to contaminate 6 miles of shoreline? I don't know if I start with the calculating the circumfrence or what?
Click here to see answer by ankor@dixie-net.com(15656)

Question 321572: Sketch and describe the locus of points equidistant from two circles having the same center and radii of 7 centimeters and 11 centimeters.
Click here to see answer by J2R2R(94)

Question 322351: If the radius of a circle is increased to 200% of its original size, then the area of the circle is increased to what percentage of its original size?
a. 200% b. 400% c. 800% d. 40,000% e. none of these
Click here to see answer by J2R2R(94)

Question 322450: What is the diameter of a cirlce that has a 3" square inside?
Click here to see answer by solver91311(16897)

Question 322595: a circular fountain 10 ft. in diameter has a walk 3 ft wide around it. what is the area of the walk?
Click here to see answer by jessica43(140)

Question 323002: how can I draw a 20 meter circle (65.62Ft)
I would use a rope and white sand to draw it out.
I would have to start in the middle to keep it in the corner of the riding ring.
(This is for horse training) Hope it is simple for you NOT for Me! Thanks
Click here to see answer by Fombitz(13828)

Question 323133: show that the triangle of maximum area that can be inscribed in agiven circle is an equilateral triangle.
Click here to see answer by galactus(183)

Question 323188: The area of a circle is 35 square meters. What is is circumference?(use n=3.14. Hint: Area of a circle: A= nr^2 and circumference of circle:c = 2nr
Click here to see answer by checkley77(12569)

Question 323420: A semicircular window of radius 10 inches is to be laminated with a sunblock coating that costs $0.85 per square inch to apply. What is the total cost of coating the window, to the nearest cent? (Use п = 3.14. Hint: Area of Circle: A = пr2)
I am not sure how to do this problem

Click here to see answer by checkley77(12569)

Question 324860: if the circumference of a circle is 64 cm, what is the lenth of an arc that measures 45 degrees?
Click here to see answer by Alan3354(30993)

Question 324859: if the circumference of a circle is 64 cm, what is the lenth of an arc that measures 45 degrees?
Click here to see answer by nyc_function(2733)

Question 324906: The two semicircles in the figure are tangent to each other. The radius of the quadrant and the diameter of the large semicircle are each 2. Find the diameter of the smaller semicircle
Click here to see answer by Fombitz(13828)

Question 325280: A two-dimesional, silo-shaped figure is formed by placing a semicircle of diameter 1 on top of a unit square, with the diameter coinciding with the top of the square. What is the radius of the smallest circle that contains this figure?
Click here to see answer by Alan3354(30993)

Question 325377: A circle has a radius of 8 inches. Find the area of a sector of the circle if the sector has an arc that measures 45°.
Click here to see answer by checkley77(12569)

Question 325528: bike wheel has a radius of 13in what is the circumference do not round your answer
Click here to see answer by Fombitz(13828)

Question 325991: A circle with center (-3,4) is tangent to the x-axis in the standard (x,y)
coordinate plane. What is radius of this circle?

Click here to see answer by Fombitz(13828)

Question 326056: A racetrack has two semi-circular turns, each with a radius of 1000ft, and two straightaways, each 2000 feet long. To the nearest second, how long will a car traveling 120 miles per hour take to complete one lap on the track?
Click here to see answer by nyc_function(2733)

Question 326250: find the radius of a circle with diameter d=81 yards
Click here to see answer by solver91311(16897)

Question 326793: If a wheel that has a radius of 1 foot rolls 5 complete revolutions, how far will it travel? I know the answer is 2.5 ft, but I don't know how to get the answer. Thank you.
Click here to see answer by Alan3354(30993)

Question 327055: A wagon wheel is placed against a wall as
shown in the accompanying figure. One point on the edge
of the wheel is 5 inches from the ground and 10 inches
from the wall. What is the radius of the wheel
Click here to see answer by galactus(183)

Question 327470: The circle 4x2 + 4y2 + 8 = 0 has its center at ___________
Click here to see answer by stanbon(57374)

Question 328353: The area of the equiangular is 100 square root of 3 square centimeter. Find the area of the shaded segment.

Click here to see answer by Alan3354(30993)

Question 328517: Two circles intersect at points V and W. The radius of the larger circle is 17, and the radius of the smaller circle is 10. Neither circle's center is inside the other circle. If the length of the vertical line VW is 16, what is the length of the segment connecting the circle's centers?
Click here to see answer by solver91311(16897)

Question 328655: A wheel revolves at a rate of 40 revolutions per second. If the radius of the wheel is 2/pi feet, how far will the wheel travel in 2 minutes?
Click here to see answer by mananth(12270)

Question 328658: one circle is circumscribed around a square that has sides of length 2. Another circle is inscribed in the same square.
Find the ratio of the area of the larger circle to that of the smaller circle
Click here to see answer by mananth(12270)

Question 328630: how to solve this?
what is the length,in feet, of the circumference of a circle whose diameter is 12 feet?
Click here to see answer by rapaljer(4667)

Question 328656: A pentagon is inscribed in a circle. What is a possible number of the pentagon's diagonals that can be diameters of the circle?
Click here to see answer by Theo(3464)

Question 328749: A chord at a distance 6 from the center of a circle with diameter 24 forms a segment (shaded) with its minor arc. What is the area of this segment?
Click here to see answer by Fombitz(13828)

Question 328654: At a speed of 30 degrees per second, how long will it take a wheel of radius 10 inches to roll 100
Click here to see answer by galactus(183)

Question 328828: two wheels have diameters of 12 inches and 18 inches respectively. Both wheels roll along parallel straight lines at the same linear speed until the larger wheel has revolved 72 times. at this point how many times has the smaller wheel revolved?
Click here to see answer by checkley77(12569)

Question 329434: Part a) Given three noncollinear points,construct the circle and then write the equation of the circle.
The points are A(12,-1),B(6,-3),C(4,3)
Part b) Using the equation and graph of the circle above,determine if the following lines are tangent,secant, or neither.
y=1
y=2x-1
Click here to see answer by Fombitz(13828)

Question 330581: How do you find the arc of a circle when you have a tangent line?
Click here to see answer by Alan3354(30993)

Question 330636: How do you find the circumfrence of a circle when you only know the arc length?
Click here to see answer by Fombitz(13828)

Question 330904: If a circle with a diameter of 4 inches rotates 1,000 degrees, what distance will any one spot on it's edge actually travel?
Click here to see answer by Fombitz(13828)

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