Question

Pls help pefer if you can somewhat explain (Grade 11) (ASAP) (Urgent)​

Answer 1

17) h=I(1-cosθ); 18) h=1.404.

Explanation:

17) h=I-BC;

In ΔABC: m(∠C)=90°, m(∠B)=θ, AB=I, then BC=AB*cos(∠B); ⇒ BC=Icosθ;

Then h=I-Icosθ or h=I(1-cosθ).

18) if I=6 and θ=40°, then h=6(1-cos40°)≈6*(1-0.766)=1.404, where cos40°≈0.766.

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