Question 3 of 21beginner🔧 ApplyNumerical3 marks
Find the missing terms: a. Perimeter of a rectangle = 14 cm; breadth = 2 cm; length = ? b. Perimeter of a square = 20 cm; side of a length = ? c. Perimeter of a rectangle = 12 m; length = 3 m; breadth = ?
(a)
Answer
Length = 5 cm
(b)
Answer
Side = 5 cm
(c)
Answer
Breadth = 3 m
Explanation
(a) Perimeter = 2 × (length + breadth). So, 14 = 2 × (length + 2). Therefore, 7 = length + 2, and length = 5 cm. (b) Perimeter of a square = 4 × side. So, 20 = 4 × side. Therefore, side = 20 ÷ 4 = 5 cm. (c) Perimeter = 2 × (length + breadth). So, 12 = 2 × (3 + breadth). Therefore, 6 = 3 + breadth, and breadth = 3 m.