Triangles Flashcards
0
Q
Isosceles triangle
A
45• 45• 90•
1 : 1 : ✔2
X : x : X ✔2
1
Q
Common right triangles
A
3-4-5 (6-8-10; 9-12-13; 11-16-20)
5-12-13 (10-24-26)
8-15-17 (none)
2
Q
Equilateral triangle
A
30• 60• 90•
1: ✔3 : 2
X: X✔3 : 2x
3
Q
d = s✔2
A
Diagonal of a square
4
Q
d= s✔3
A
Diagonal of a cube
5
Q
One pair of opposite sides is parallel.
A
Trapezoid
6
Q
All sides are equal. Opposite angles are equal.
A
Rhombus (type of parallelogram)
7
Q
Opposite sides and opposite angles are equal.
A
Parallelogram
8
Q
All angles are 90• and opposite sides are equal.
A
Rectangle
9
Q
All angles are 90•. All sides are equal.
A
Square
10
Q
Sum of interior angles of a polygon
A
(n-2) x 180
11
Q
Area of triangle
A
(Base x height)/2
12
Q
Area of rectangle
A
Length x width
13
Q
Area of trapezoid
A
((Base1 + base2) x height)/ 2
14
Q
Area of parallelogram
A
Base x height
