What is the approximate area of a circle with a radius of 14 centimeters

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.

What three-dimensional solid have 6 rectangular faces, 2 equal bases that are not rectangles and 18 edges