Answer:
perimeter of circle=2πr
16=2πr
r=16/2π=8/πcm
now.
area of circle=πr²=π(8/π)²=π×64/π²=64/(22/7)=64×7/22=20.36cm²
Answer:
15
Step-by-step explanation:
18-x=3
18-3=x
18-3=15
Answer:
○ A) 21 ft.²
Step-by-step explanation:

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The angle to the left of angle 1 is 70, so angle 1 is equal to 180 - 70 - 70 which is 40,
Answer: 306 cm^2
Step-by-step explanation:
Surface is found by add all the areas of the sides together, including sides, top and bottom. You might need to divide the 3D shape into different shapes in order to find the area of the sides/top/bottoms. Area for rectangle = bxh.