# Math algebra

It say to find the area of the irregular shape and it's a semi circle with the diameter of 5 and a square measure 8 and I got the area of the rectantagle which is 40 and now I got to find the area of the semi circle but it say the radius for the formula and I can't find get the rest but I need to explain my answer. A. 90.2cm squared B.241cm squared C.65.1cm squared D 72.3cm squared PLZ HELP!

1. I ment I found the area of the rectangle I just need the semi circle and then add it up to find the amswe

posted by Cats24
2. A square of measure 8 does not have an area of 40.

A 5x8 rectangle has an area of 40.

You have a formula for the area of a circle, using its radius. Since the diameter is twice the radius,
πr^2 = π(d/2)^2 = πd^2/4

A circle of diameter d has area πd^2/4

you have a semicircle, so its area is πd^2/8 = 25π/8 = 9.82

40+25π/8 = 49.82

Hmmm. There must be something missing, since none of the answers comes even close.

Hmm -- maybe you do have a square of side 8.

64+25π/8 = 73.82

That looks close to D with a typo.

posted by Steve

First Name

## Similar Questions

1. ### Algebra

Find the area of the irregular shape. Round to the nearest tenth. There's a semi-circle on top of a rectangle with 8 as the base and 5 as the height. A. 90.2 sq cm B. 241 sq cm C. 65.1 sq cm D. 72.3 sq cm Find the area of blue
2. ### Algebra

Find the area of the irregular figure (use 3.14 for pi). SHow your work. Round to the nearest tenth. Triangle with a semi-circle on it. The triangles height is 4.8ft and the circle's diameter is 3.6ft. Every time I do my work I
3. ### geometry

I need to find the area of the shaded portion of a circle with a square in the middle all corners touching the circle. My square has a line measurement of 10 cm. I know that the area of the square is 100 cm(10 x 10). But I am not
4. ### Math

I need to find the area of a shaded part. it is a square with a circle the measurements that I have are pi = 3.14 and 15 ft by 15 ft. I know to find the area of the square I take base x height but cannot figure out correct formula
5. ### Geometry

I have a picture of a window showing a square in the center with sides measuring 4 feet, over each side of the square is a semi-circle(a total of 4 semi-circles), how can I find the area of the window? Should I find the area of
6. ### Geometery

How do I solve this? On my assignment it says find the area inside the square, but outside the circle, given that the radius of the circle is 2 ft. Use 3.14 for ^ I have a picture of a square with a circle in the square, with a
7. ### geometry

A square ABCD is inscribed in a circle. The circle is folded to form a semi-sircle, and another square EFGH is inscribed in this semi-cirlcle. Find the ratio of the area of the square EFGH to the area of the square ABCD.
8. ### Algebra- circles

On my paper, there's a circle drawn inside of a square, whose side length is 12. I have to find diameter, radius, area, area in terms of pi, ... For the diameter first of all, would it be 12? Or do I have to subtract? Thanks.
9. ### math

1. A wire of length x is bent into the shape of a square. Express the area A as a function of x only. 2. A circle of radius x is inscribed in a square. Find the area inside the square but outside the circle as a function of x
10. ### math

the diameter of two circles are in the ratio of 2:3. Find the area of the smaller circle if the area of the larger circle is 63pie square meters

More Similar Questions