Can you tell the difference between congruent and similar shapes? 1. Write whether the pairs of shapes are congruent or not congruent.

let's determine if these pairs of shapes are congruent.

First, let's clarify the definitions provided in the image:

• Congruent shapes have equal sides and equal angles. They are exactly the same in shape and size.
• Similar shapes have equal angles but not equally long sides. They are the same shape but different in size.

The question asks whether the pairs of shapes are congruent or not congruent. If shapes are similar but not the same size, they are considered "not congruent."

Step 1: Analyze each pair of shapes based on their exact match in shape and size.

• a. The two parallelograms appear to be identical in both shape and size.

  • Answer: $\boxed{\text{Congruent}}$

• b. The two right-angled triangles appear to be identical in both shape and size.

  • Answer: $\boxed{\text{Congruent}}$

• c. The first shape is a plus sign, and the second is an 'X' shape. They are clearly different shapes.

  • Answer: $\boxed{\text{Not congruent}}$

• d. The two quadrilaterals are different in both shape and size.

  • Answer: $\boxed{\text{Not congruent}}$

• e. The two rounded rectangles are the same shape but are clearly different in size.

  • Answer: $\boxed{\text{Not congruent}}$

• f. The two octagons are the same shape but are clearly different in size.

  • Answer: $\boxed{\text{Not congruent}}$