A triangle 7

A triangle lot has the dimensions a=15m, b=10m, and c=20m. What is the measure of the angle between the sides of b and c?

Correct answer:

α =  46.5675 °

Step-by-step explanation:

a=15 m b=10 m c=20 m  c2=a2+b2=152+102=5 13 m18.0278 m c2=c  a2=b2+c22 b c cosα  α=π180°arccos(2 b cb2+c2a2)=π180°arccos(2 10 20102+202152)=46.5675=46°343"

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