D3(RAH) MASTER THE DAY

What is the sum of internal angles of a pentagon?

• 540°
• 450°
• 720°
• 360°

Answer explanation

Sum of internal angles of a pentagon = (5-2)×180° = 540°.

What is the perimeter of a square with side 18 cm?

• 36 cm
• 90 cm
• 72 cm
• 81 cm

Answer explanation

Perimeter of square = 4 × 18 cm = 72 cm.

How many sides does a hexagon have?

• 8
• 5
• 7
• 6

Answer explanation

Hexagon has 6 sides.

What is the area of a circle with radius 7 cm?

• 49 cm²
• 44 cm²
• 154 cm²
• 22 cm²

Answer explanation

Area of circle = π × 7² = 154 cm².

Which triangle has one angle equal to 90°?

• Right-angled triangle
• Equilateral triangle
• Obtuse triangle
• Acute triangle

Answer explanation

Right-angled triangle has one 90° angle.

Which figure has opposite sides parallel and equal but angles are not 90°?

• Rectangle
• Rhombus
• Parallelogram
• Trapezium

Answer explanation

Rhombus has opposite sides equal and parallel but angles are not necessarily 90°.

What is the formula for the area of a sector in radians?

• r²θ/2
• πrθ/2
• rθ²
• πr²θ

Answer explanation

Area of sector in radians = (r²θ)/2.

What is the formula for the arc length in radians?

• rθ/2
• rθ
• πr/θ
• 2πr

Answer explanation

Arc length in radians = rθ.

Which solid has two parallel circular faces?

• Sphere
• Cone
• Cube
• Cylinder

Answer explanation

Cylinder has two parallel circular faces.

What is the volume of a right circular cone?

• 1/3 πr²h
• 2/3 πr²h
• πr²h
• 4/3 πr³

Answer explanation

Volume of cone = 1/3 πr²h.