Corresponding sides are proportional. This implies that the ratio of the length of side DE to side AB is equal to the ratio ...

An exterior angle of a triangle is equal to the sum of the two non-adjacent interior angles. This theorem provides another ...

Click to see a step-by-step guide. STEP 1: Use the ruler to draw a diagonal line from the bottom right corner of the paper to the top left corner. Mark the 90° right angles in the bottom left and top ...

Interior angles in a triangle add up to 180˚. Triangles close triangleA polygon with three straight sides. have three sides, therefore they have three angles. Interior angles in a triangle sum to a ...