Math algebra
posted by Cats24
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!

Cats24
I ment I found the area of the rectangle I just need the semi circle and then add it up to find the amswe

Steve
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.
Respond to this Question
Similar Questions

math
if A (2, 1) and B (4,7) are endpoints of a diameter of a circle, what is the area of the circle? 
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 base 
Adv. Math
How do you do these problems??? What is the radius of a circle that its area is 254.5 square inches? 
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 sure … 
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 semicircle(a total of 4 semicircles), how can I find the area of the window? 
geometry
A square ABCD is inscribed in a circle. The circle is folded to form a semisircle, and another square EFGH is inscribed in this semicirlcle. Find the ratio of the area of the square EFGH to the area of the square ABCD. 
Math
The radius of the larger circle is 9cm. The diameter of the smaller circle is 11cm. Find the area of the shaded region The shaded area is between the larger circle and smaller circle . It is concentric The area of the larger circle … 
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 
Algebra
Find the area of the irregular shape. Round to the nearest tenth. There's a semicircle 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 portion … 
Algebra
Find the area of the irregular figure (use 3.14 for pi). SHow your work. Round to the nearest tenth. Triangle with a semicircle on it. The triangles height is 4.8ft and the circle's diameter is 3.6ft. Every time I do my work I keep …