By using the Pythagorean theorem formula, we can calculate the value of 'a':
a^2 = c^2 - b^2
a^2 = 15^2 - 12^2
a^2 = 225 - 144
a^2 = 81
Taking the square root of both sides, we get:
a = √81
a = 9
Therefore, the value of 'a' is 9.
a = ?
b = 12
c = 15
c2-b2=a2
1 answer