Question

Calculate the area of shaded regions

Answer 1

Answer:

(a)62.8cm2

(b) 201cm2

(c)53.5

(d)

(e)

(f)

Step-by-step explanation:

(a) In shape a we can see two triangles with their respective height and base.

To find the area, we must multiply first one of them 8x6.5=52 and the halve this answer which gives us 26.

Then we must concentrate on the bottom triangle 4.6x8=36.8.

Adding this two triangle areas will give us 62.8cm2.

(b) The area of a circle is found by $\pi *r^{2}$. So $\pi *100$ is the total area of the entire circle. Then we must find the little one which is $\pi *36$.

Rounding this two anwsers, the first one appears to be 314 and the second one 113.

We must then subtract these two (314-113= 201).

(c) In this one we must also calculate the area of the circle which is 25 (half the diameter squared) x pi. 78.5 is aproximately the result which subtracted from the area of the square (25)=53.5

(d) The same methods are applied for this one 32 is the diameter of the big circle so 16 is the ratio. 16x16=256...