Show:
Triangles
Shapes and Stuff
Circles
Circles (continued)
Polygons
and Radicals
100

What is the formula for the area of a triangle?

  1. Area= 0.5 (base x height)

100

What is the formula for the area of a parallelogram (and a rectangle)? 

(Hint: They're the same formula)

Area= base x height

100

What is the formula for the area of a circle?

Area= pi (radius^2)

100

If the radius of a circle is 10 inches, what is the diameter of the circle (in feet)?

240 feet

100

√ x  multiplied by  √ x  is equal to what?

X

200

What is Pythagorean Theorem used for? What is the equation?

  1. - to find the sides of right triangles

  2. - a^2 + b^2= c^2

200

Are all squares rectangles or are all rectangles squares?

All squares are rectangles but not all rectangles are squares!

200

What is the formula for the circumference of a circle?

Circumference= 2 x pi x radius

OR 

Circumference= diameter x pi

200

If the area of a circle is 64 x pi, what is the radius of the circle?

8

200

√ x multiplied by √ y is equal to what?

√ xy

300

What's the rule for the sides of 45-45-90 triangles?

  1. the side opposite the 45's: x

  2. the side opposite the 90 : x times radical 2

300

What is the formula for the area of a trapezoid?

Area= 0.5 x height (base 1 + base 2)

300

What are the first 3 digits of pi?

3.14159……

300

If the area of a semicircle is 100 x pi, what is the diameter of the semicircle?

20

300

√ x + √ x is equal to what?

2√ x

400

What's the rule for the sides of 30-60-90 triangles?

the side opposite the 30: x

the side opposite the 60: x times radical 3

the side opposite the 90: 2x

400

What are the 2 properties of a parallelogram?

(Hint: Think sides and angles)

  1. Opposite sides are equal

  2. Opposite angles are equal

400

What is the formula for the area of a sector?

Area of a sector= (theta/360)pi(radius^2)

400

What is the area of a 90 degree sector where the diameter is equal to 2 inches?

0.25 x pi 

OR 

0.7854 inches^2

400

What is the formula for the area of a polygon?

Area= 0.5 (apothem)(perimeter)

500

Name one of the three pythagorean triples.

5-12-13

3-4-5

7-24-25

500

What are the properties of a kite?

(Hint: Think sides, angles, and diagonals)

  1. Two pairs of adjacent, equal sides

  2. Two angles are equal when unequal sides meet

  3. When the two diagonals connect, they form right angles

500

What is the formula for the area of a semicircle?

Area= (pi x radius^2)/2

500

What is the circumference of a circle if the radius is 40 meters?

80 x pi OR 251.32 meters

500

What is an apothem?

The “radius” of a polygon