# 11COMPLEX SHAPES!

MA.7.4.1Determine how measurements such as perimeter and area, of common shapes are affected when one of the

attributes is changed in some way.

By:

Definition.

Combine parts or all of simple shapes.

Drawing.Half circle rectangle

Half circle

This shape combines two or more simple shapes (rectangle, half circles) to make one

complex shape.

Create a question !Roy was getting school supplies and it came downTo erasers. The school says that the erasers need to be Oval shaped and have to have an area of at least 1502 mm. he found the eraser below. . . . . . . . . . . . . . .

What is the area of Roy’s eraser?

Is it big enough for Roy to use?

4 mm

10 mm

Solution! Solution! Solution!

Area of circle = R* R* Pidiameter = 4, 4/2 = 2, radius = 22* 2 = 4* 3.14 =12.56 mm2

Area of a rectangle = L* W10* 4 = 40 mm2

Area of circle andRectangle = 12.56 + 40Area = 52.56 mm2

52.56 mm2 < 150 mm2

Answers: The area of the eraser is 52.56 mm2, and no it is not big enough for Roy to use in school.

Thanks for watching!!!!!The people that I’d like to thank are. . . . . . .

ME!!!!!!!!

And google for giving me pictures!!

And Mr.Imamura!!!!

And that’s it!! the rest of you did nothing for the good of me!!!