Question 890405
one of the equal angles of an isosceles triangle is 35 degree. If the base measures 20 cm, find the perimeter and the area of the triangle.
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let x=length of each equal side
let h=height of triangle
cos 35˚=10/x
x=10/cos 35˚≈8.19
perimeter=2*8.19+20≈36.38 cm
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tan 55˚=10/h
h=10/tan 55˚=7.00
Area=1/2*base*height=1/2*20*7.00≈70 cm^2