Question

Find the missing value in each of the following.
(a) In a rectangle, length = 15 cm, breadth = 8 cm, area = ?
(b) In a rectangle, perimeter = 5 m, breadth = 90 cm, length = ?, area = ?
(c) In a square, side = 8cm, perimeter =?, area =?
(d) In a square, area = 81 cm², side = ?, perimeter = ?
2. If the area of a rectangle is 96 cm² and one of its side is 8 cm, then find the perimeter of the rectangle.
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Answer 1

Step-by-step explanation:

(a)

$area \: = length \times breadth \\ area = 15 \times 8 = 120 {cm}^{2}$

(b)

Perimeter = 2(length + breadth)

500 = 2(length + 90)

250 = length + 90

length = 160

so area = 160 × 90 = 14400 square cm.

(c)

area of square = 8 x 8 = 64 square cm.

Perimeter = 4 × 8 = 32 cm.

(d)

$area \: = 81 \\ {side}^{2} = 81 \\ side = 9 \: cm \\ \\ perimeter \: = 4 \times 9 = 36 \: cm$

2. Area = length × breadth

96 = length × 8

length = 12 cm

so, Perimeter = 2(8 + 12) = 40 cm

Answer 2

Answer:

b . where is come 500 and 250 .?