Areas - Plane Mensuration Flashcards
1
Q
Area of a Square
A= ?
A
A = a²
2
Q
Area of a Triangle
A= ?
A
A= ½ bh
3
Q
Area of a Rectangle
A = ?
A
A= bh
4
Q
Area of a Parallelogram
A= ?
A
A=bh
5
Q
Area of an equilateral triangle
A= ?
A
√3
A= ——— a²
4
6
Q
Area of a Scalene Triangle
A= ?
A
A= √ s (s-a)(s-b)(s-c)
7
Q
Area of a Pentagon
A=?
A
A= ¼ √ 5(5+2√5) x a²
8
Q
Area of Hexagon
A=?
A
3√3
A= ——— a²
2
9
Q
Area of heptagon
A=?
A
7 180
A = —— a² cot ( ——— )
4 7
10
Q
Area of Octagon
A=?
A
A = 2 (1+√2) a²
11
Q
Area of Nonagon
A= ?
A
9
A = —— a² cot 20°
4
12
Q
Area of Decagon
A= ?
A
5
A = —— a² √ 5 + 2√5
2
13
Q
Area of Hendecagon
A =?
A
11 180
A= —— a² cot (———)
4 11
14
Q
Area of Dodecagon
A=?
A
A= 3 a² (2 + √3)
15
Q
Area of a Rhombus
A = ?
A
D1 + d2
A = ——————
2
