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Basic Formulas
Areas of polygons
Radius, Diameter, and pi
AREAS IN CIRCLES!
Areas of Triangles
100
The formula for the area of a polygon
What is 1/2aP
100

Which of the regular polygons is made up of equilateral triangles?

Hexagon

100

What is the radius of a circle if the diameter is 12.5cm?

6.25cm

100
Which calculation find the length of something in a circle, area or circumference?

circumference

100

If you draw a height in an equilateral triangle, what kind of congruent right triangles are created?

30-60-90

200
What is the area of a circle?
pi*r^2
200
A pentagon has a side length of 8 inches and an apothem of 5.506 inches. What is the area of the pentagon to the nearest hundredeth?
What is 110.12 inches squared.
200
What is the word for more than one radius?

radii

200
A Circle has a radius of 22.3 inches. What is its area?
What is 1562.28 inches squared.
200

If you draw a diagonal in a square, what kind of congruent right triangles are created?

45-45-90

300
What is the formula for area of a triangle?
(1/2)*b*h
300
What is the area of a hexagon with a radius of 10cm and a side length of 10cm? (Round to the nearest 10th of a cm)
259.8 cm^2
300

If Circumference is equal to pi*diameter, what ratio is always equal to pi?

Circumference to diameter

300
The area of a circle is 231.04 pi, find it's radius.
What is 15.2
300

The area of an equilateral triangle whose side measures 20 feet. Round to the nearest tenth.

173.2 feet2

400

What is the formula for area of a rectangle?

Length * width

400
What is the area of a square with a radius of 14 in?
392 in^2
400

What is the length of the diameter of a circle if its radius is 12.5?

25

400
The circumfrence of a circle is 24pi, what is the area of the circle?
What is 144 pi, or 452.39
400

Find the area of a right triangle whose hypotenuse is 13 inches and one leg is 5 inches.

30 in2

500
Formula for area of a trapezoid?
(1/2)*h*(base1+base2)
500

Find the area of a regular octagon whose apothem is 8mm and side length is 6.6mm.  Round answer to nearest tenth.

211.2mm2

500

If circumference of a circle is equal to 25*pi, then what is the length of the radius of the circle?

12.5

500

Find the area of a circle whose circumference is 16*pi

64*pi

500

A rectangular cake has an area of 120 square inches, what is the length of a diagonal cut if the length is 2 inches longer than the width?

15.6 inches