Formulas Flashcards
1
Q
Diameter of a circle
A
Diameter of a circle = 2r
2
Q
Circumference of a circle
A
Circumference of a circle = 2πr
3
Q
Area of a circle
A
Area of a circle = πr^2
4
Q
If θ = 60°, the sector would represent __of the entire circle.
A
60/360 or 1/6
5
Q
Area of sector of a circle
A
Area of sector of a circle = (θ) (πr^2)
6
Q
Arc length of a circle
A
Arc length of a circle = (θ) (2πr)
7
Q
Common triples for right angles
A
3-4-5 & all its multiples
5-12-13
8-15-17
8
Q
Trigonometric Ratios for 30°-60°-90°
A
1: square root 3 :2
9
Q
Trigonometric Ratios for 45°-45°-90°
A
1: 1: square root 2
10
Q
Area of a triangle
A
A = 1/2 x b x h
11
Q
Area of a rectangle
A
A = lw
12
Q
Area of a square
A
A = s^2 or l x w
13
Q
Area of a trapezoid
A
A = [(b1 + b2)/2] x h
14
Q
Area of a parallelogram
A
A = bh
15
Q
Formula for right triangles
A
a^2 + b^2 = c^2
