Question 1036914
We have a triangle with angles A, B, and C, and sides a, b, c.
One side is 900m. Find the other 2 sides
The angles of every triangle add up to 180 degrees
A+B+C = 180º
15+30 = 45
180-45 = 135 degrees is your third angle. Let's call them:
A = 15
B = 30
C = 135
And the sides, we'll call side b = 900m.
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The sine rule says:
a/sinA =  b/sinB = c/sin C
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Let's first find side c:
c/sinC = b/sinB Multiply both sides times sinC:
c = bsinC/sinB
= 900sin135/sin30 Use your calculator and you get:
= 1272.79 is side c
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Let's find side a:
a/sinA = b/sinB
a = bsinA/sinB
900sin15/sin30
= 465.87 is your third side
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How long was the swim?
900+1272.79+465.87 = 2638.66 meters.
See the picture I made you below
John
*[illustration triangle_perimeter.JPG]