Perimeter And Area(4th Grade > Mathematics ) Questions and Answers
Explanation:-
Answer: Option D. -> 4 cm:
D
Given : Perimeter of the given figure = 15 cm
Let the length of the third side be x.
Perimeter of a figure = Sum of lengths of its sides = AB + BC + AC
⇒ 15 cm = 6 cm + 5 cm + x
⇒ 15 cm = 11 cm + x
⇒ x = 15 cm - 11 cm
⇒ x = 4 cm
Therefore, the third side is 4 cm long.
Explanation:-
Answer: Option B. -> 200 cm2:
B
Given: The length of the sides of each square is 10 cm.
For the rectangle formed:
Length = 10 cm + 10 cm = 20 cm
Breadth = 10 cm
Area of the rectangle = Length × Breadth = 20cm×10 cm=200 cm2
Explanation:-
Answer: Option B. -> 1 cm2:
B
In the given figure, we have length = 4 cm and breadth = 14 cm
Area of the figure = length × breadth
⇒ Area of the given rectangle = 4 cm × 14 cm = 1 cm2
Explanation:-
Answer: Option B. -> 8 cm:
B
Area of a square = Side × Side
⇒ Side × Side = 64 cm2
When we look at the factors of 16,
64 = 64 x 1
64 = 32 x 2
64 = 16 x 4
64 = 8 x 8
Since the sides have to be equal, it has to be 8 cm long as 8 × 8 = 64
∴ Side will be 8 cm long.