Question

I will give brainlest so hurry and points 20 And please show your work

Answer 1

1) 8

reason: radius is diameter divided by two, 16/2

2) 6

reason: diameter is radius times two, 3 × 2

3) 87.92

reason: circumfrence is pi times diameter, 28 × 3.14

4) 31.4

reason: circumfrence is pi times diameter, 10 × 3.14

6) 61.12

reason: 10 + 10 +8+8= 36 8×3.14= 25.12 36 + 25.12= 61.12

7) 69.0172

reason: 7^2× 3.14= 69.0172

8) 346.185

reason: 21÷2= 10.5 3.14×10.5^2= 69.0172

Answer 2

Answer:

Step-by-step explanation:

1. The radius of a circle is half the diameter 16/2=8ft

2. The diameter of a circle is double the radius so 3*2=6m

3. $C=2\pi r=2*\pi *14=87.96ft$ this i your circumference formula

4. $C=2\pi r=2*\pi *5=31.42mm$

5. $C=\pi r=\pi *6=18.85mi$

6. (semicircle) $C=\pi 4=12.57cm$

(rectangle) = $P=2(l+w)=2*(10+8)=36$

add both together $12.57+36=48.57cm$

7. $A=\pi r^2=\pi 7^2=153.94ft^2$

8. $A=\pi r^2=\pi 10.5^2=346.36mm^2$

9. $\frac{\pi r^2}{2} =\frac{\pi 4^2}{2} =25.13cm^2$

10. (semicircle) $A=\frac{\pi r^2}{2} =\frac{\pi 25^2}{2} =981.75m^2$

(rectangle) $A=wl=100*50=5000m^2$

add both together

$981.75+5000=5981.75m^2$