You can use the sum and difference identities which for cosine is cos(a+b)= cosacosb-sinasinb
Answer:
A = 157 in^2
Step-by-step explanation:
First, we need to get the radius, we can do this by dividing our given diameter by 2.
20/2 = 10
Now, we have our radius of 10 inches.
Formula for Area of a Semi Circle: (1/2)(pi(r^2)
Input values.
(1/2)(3.14(10^2)
Solve.
(1/2)(3.14(100)
(1/2)(314)
1/2(314) = 157
Finally, we have our result which is 157 inches^2.
1. 50 + 20x = 240
2. 85% so more than 75%
3. 25.9% so about 26%
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For what shape??
pls answer, then we can get somewhere with this question!! :)
