Question

The base of a triangle is 13 cm rounded to the nearest integer.

The perpendicular height of the triangle is 4.7 cm rounded to 1 dp.
Write the error interval for the area, a, of the triangle in the form m ≤ a < n.

Answer 1

30.55 <_ a < 30.55

Explanation:

a = 1/2 × b × h

a = 1/2 × 13 × 4.7

a = 30.55 cm^2

30.55 <_ a < 30.55