book Maths Puzzle Numerical Ability

The height of an equilateral triangle is 18 meters. What is its area?

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book Other Question

-7n-10=4 4. Here is a picture of two cubes:
a)The two cubes are exactly alike.
b)The hidden faces indicated by the dots have the same alphabet on them.
Which alphabet-q, r, w, or k is on the faces indicated by the