Section 3.5: Calculating perimeter and area GRADE 10 CAPS
[Pages:27]MATHEMATICAL LITERACY GRADE 10 CAPS
TOPIC 3: Measurement Section 3.5: Calculating perimeter and area
Measurement
The following sections will be covered:
3.1 Conversions 3.2 Measuring length and distance 3.3 Measuring weight 3.4 Measuring temperature 3.5 Calculating perimeter and area
2
Perimeter and Area
In section 3.5, Learners should be able to determine:
The perimeter of squares, rectangles and circles. The area of squares, rectangles and circles.
Perimeter and circumferences
The perimeter of a shape is the total distance around the boundary of the given shape.
Circumference is the perimeter of a circle.
The units of perimeter are the units of length: mm, cm; m; km
Perimeter of plane shapes
Calculating Perimeter
Perimeter of a Square
1. P = AB + BC + CD + DA
Sum of all side
= 6 cm + 6cm + 6 cm + 6 cm
= 24 cm
or
P = 4s = 4 x 6 cm = 24 cm
Using formula for perimeter of a square
Perimeter of a Rectangle
2. Perimeter = PQ + QR + RS + SP
= 7 cm + 9 cm + 7 cm + 9 cm
= 32 cm
or
P = 2(L + B)
Using formula
= 2(9 cm + 7 cm)
= 2(16 cm)
= 32 cm
Sum of sides
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