Thread:Balu.ur/@comment-25501845-20141110152352/@comment-24808864-20141110185354

 1) Area of triangular surface is calculated as 1/2 * altitude (height) * base. If altitude of a triangle is increased by 5% and the base of the triangle is increased by 7%. What percenage would the area of the triangle increase?

a)3.33%

b)6.00%

c)12.00%

d)12.35%

Hint: Represent the unknown amounts by variables (perhaps h for height and b for base).
 * 1) Area of the triangle is $$ \frac{1}{2}(b\times h) $$.

.
 * 1) Increasing altitude by 5% would mean it would become $$1.05h$$ and increasing the base by 7% would mean it would become $$1.07b$$.
 * 2) Recalculate the area with these new values, and see how it compares to the original...this should give you an insight to the answer.

PS: You can also "pretend" that the base and altitude are convenient numbers (like one and one) and then use these convenient numbers to find the percentage increase.