Mental Maths Class 5 Other

Asked by AKSHAY GURU VARADHARAJAN · SRI CHAITANYA TECHNO SCHOOL, JAYANTI NAGAR.

The perimeter of an equilateral triangle is 33 cm. What will be its new perimeter if each side is increased by 3 cm?

Answer as guest — Start Free Practice Test to earn Practice PointsHow to earn pointsAsk a question+3Answer a question+1Someone answers yours+1Your Q gets upvoted+1Pioneer bonus (first 5)+5, ask questions & climb the leaderboard!

A 42 cm
B 108 cm
C 56 cm
D 99 cm

Show answer and explanation

Answer: A. 42 cm

To find the new perimeter:
Find the original side length: 33 cm ÷ 3 = 11 cm.
Increase each side by 3: 11 cm + 3 = 14 cm.
Calculate the new perimeter: 14 cm × 3 = 42 cm.
Alternatively, since there are 3 sides, the total perimeter increases by 9 (3 × 3). So, 33 + 9 = 42 cm.

Answering after opening this box earns no Practice Points.

2 answered 50% got it right

Rules for asking and answering

The perimeter of an equilateral triangle is 33 cm. What will be its new perimeter if each side is increased by 3 cm?

More questions like this