A triangle has a base of 7 cm and a height of 12 cm. What is its area?
Answer and explanation
Correct answer: B. 42 cm²
- Step 1: Area of a triangle is $\tfrac12 \times base \times height = \tfrac12 \times 7 \times 12 = 42$ cm². Answer: 42 cm². Why not the others: 84 cm²: forgets to halve. 19 cm²: adds base and height. 21 cm²: halves twice.
Practise more Problem Solving in Mathematics.
Free questions with an explanation for every one, and full timed ENLA Secondary Practice (Peru) mock tests.
More Problem Solving in Mathematics questions
- A school notebook costs S/ 4.50. How much do 6 of these notebooks cost in total?
- A rectangular garden is 12 m long and 7 m wide. What is its perimeter?
- The ages of five cousins are 4, 8, 6, 10 and 12 years. What is their mean age?
- Solve for : .
- A bag holds 3 red, 5 blue and 2 green marbles. One marble is drawn at random. What is the probability that it is red?
- A jacket priced at S/ 150 has a 20% discount. How much does the customer pay?