2019 · Q57
The sides of a triangle are 30 cm, 28 cm and 16 cm respectively. In order to determine its area, the logarithm of which of the quantities are required?
Elementary MathematicsGeometry: Lines, Angles and Triangles
- A37, 11, 28, 16
- B21, 30, 28, 7
- C37, 21, 11, 9
- D37, 21, 9, 7
Explanation
s = (30+28+16)/2 = 37. By Heron, area = sqrt(37x7x9x21), so the logarithms needed are of 37, 7, 9 and 21.