Perform Calculation
Perform Calculation
Perform Calculation
Rectangle
Square
Rhombus
Trapezium
PERFORM
CALCULATION
PERFORM CALCULATION:
MOST COMMON SURFACE
AREAS ILLUSTRATED:
RECTANGLE SQUARE
TRIANGLE
RHOMBUS TRAPEZIUM
CIRCLE PARALLELOGRAM
PERFORM CALCULATION:
The height(h) of a triangle, a
rhombus, a parallelogram or a
trapezium, is the distance from a top
corner to the opposite side called
base(b).
b
PERFORM CALCULATION:
w
H
l
PERFORM CALCULATION
w d h
l b
h
h
b b
TRIANGLE
• The surface area or surface (A) of a
triangle calculated by the formula:
A (rhombus or parallelogram) = b x h
A (trapezium) =0.5 (b + a)
xh
• The top (a) is the side opposite and
parallel to the base (b). In a trapezium
only the base and the top run parallel.
TRAPEZIUMS
• The top (a) is the side opposite and
parallel to the base (b). In a trapezium
only the base and the top run parallel.
CIRCLES
• The surface area or surface (A) of a circle is
calculated by the formula:
• A (circle) = 1/4 (¶ x d x d)
= 1/4 (¶ x d2)
= 1/4 (3.14 x d2)
• Given
• Square: length = 4 cm
width = 6 cm
• Test 2. Compute for the surface area.
• Rectangle: length = 5 cm
width = 5.3 cm
• Trapeziums:
b=6
t=2
h=6
• Circles
d = 4.5