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Can someone solve this and explain it in steps to someone that have never learned this?

Can someone solve this and explain it in steps to someone that have never learned-example-1

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9 votes

Answer:

Explanation:

in third quadrant sin is negative.

sin² θ+cos² θ=1

sin²θ+(-16/20)²=1

sin²θ+(-4/5)²=1

sinθ=±√(1-16/25)

=±√((25-16)/25)

=±√(9/25)

=±3/5

so

sin θ=-3/5

User Amadeu Cabanilles
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