Find the area of a triangle whose length of two sides are 4 cm and 5 cm and the angle between them is 45°.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 5 cm2.
Given that
A triangle whose length of two sides are 4 cm and 5 cm and the angle between them is 45°
Formula used
Area of a triangle = 1/2 × a × b × sin(θ)
where a and b are sides of the triangle and θ is the angle between them
Calculation
Area of a triangle = 1/2 × 4 × 5 × sin(45°)
= 10 × (1/√2)
= 5 cm2