Area of rhombus =(d₁ x d₂)/2

Correct Option: A

Area of rhombus =(d₁ x d₂)/2
=(1 x 1.5)/2 m²
= 0.75 m²

Perimeter of rhombus
= 2 √ d₁ ² + d₂ ²

Correct Option: B

Perimeter of rhombus
= 2 √ d₁ ² + d₂ ²
= 2 √(4.8)² + (1.4)²
= 2 √23.04 + 1.96
= 2 √25
= 2 x 5 = 10 cm

Sum of angles = 360°

Correct Option: A

Let First angle = 3k
Second angle = 4k
Third angle = 5k and
Fourth angle = 8k

We know 3k + 4k + 5k + 8k = 360°
⇒ 20k = 360°
∴ k = 18 °

Measure of smallest angle = 3k
=3 x 18 °
= 54 °

Number of tiles needed = (Area of square room) / (Area of tile)

Correct Option: C

Area of square room = (10)² = 100 sq m
= 100 x (100)² sq cm
= 100 x 100 x 100 sq cm

Now, area of tiles = (50)² = 50 x 50 sq cm
∴ Number of tiles needed = (Area of square room) / (Area of tile)
= (100 x 100 x 100) / (50 x 50)
= 400

Hence, 400 tiles will be needed.

Let the third side be x.
According to the question,
x + 20 = 26

Correct Option: A

Let the third side be x.
According to the question,
x + 20 = 26
⇒ x = 26 - 20 = 6 cm
∴ Each equal side = 20/2 = 10 cm