Question

Triangle ABC is shown on the grid below.

Which value best represents the length of AB?


a 8 units
b 12 units
c 15 units
d 21 units

Answer 1

15 units

Explanation:

you have to use pythagoras to solve (c²=a²+b²)

AB is the longest side of the triangle which is c in the pythagoras

so counting the units for AC, you get 9 units, and CB you get 12 units

now solve for c in pythagoras

c²=9²+12²

c = 15 units