All the solutions provided in **McGraw Hill My Math Grade 3 Answer Key PDF Chapter 14 Check My Progress **will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 3 Chapter 14 Check My Progress Answer Key

**Check My Progress Page No. (857 – 858)**

**Vocabulary Check**

**State whether each sentence is true or false. If false, replace the highlighted word to make a true sentence.**

Question 1.

A triangle with a right angle is a right triangle.

Answer: The statement “A triangle with a right angle is a right triangle.” is true.

Question 2.

A polygon that has 5 sides and 5 angles is a hexagon.

Answer: The statement “A polygon that has 5 sides and 5 angles is a hexagon.” is false. The true statement is A polygon that has 5 sides and 5 angles is a pentagon.

Question 3.

An octagon is made when two rays share the same endpoint.

Answer: The statement “An octagon is made when two rays share the same endpoint.” is false.

**Concept Check**

**Describe each shape. Determine the number of sides and angles. Then classify each shape.**

Question 4.

_____________ sides

_____________ angles

This is a(n) ______________.

Answer:

Four sides

Four angles

This is a Quuadrilareral.

Question 5.

_____________ sides

_____________ angles

This is a(n) ______________.

Answer:

Three sides

Three angles

This is a Right-angled triangle.

Question 6.

Describe the attributes of the quadrilateral below. Then classify the quadrilateral.

Answer:

The shape has two parallel sides. This is a parallelogram.

**Problem Solving**

Question 7.

A triangle is a musical instrument. Circle the phrase that best describes the angles of the red triangle.

all angles are greater than a right angle

all angles are less than a right angle

one angle is equal to a right angle

Answer:

The above triangle has equal sides.

So, all angles are less than a right angle.

Question 8.

Rhonda created two differently-named quadrilaterals with toothpicks. Both quadrilaterals have sides of the same length. What two quadrilaterals did she create?

Answer:

The quadrilateral with the same length is known as a square.

Thus Rhonda created a square with toothpicks.

Question 9.

Cole says that all quadrilaterals are polygons, but not all polygons are quadrilaterals. Is he correct? Explain.

Answer:

Given the statement is Cole says that all quadrilaterals are polygons, but not all polygons are quadrilaterals.

What is Cole said is correct.

A quadrilateral is a polygon with 4 sides.

But not all polygons are quadrilaterals.

Question 10.

Three picture frames are on a dresser. Two are shaped like squares and the other is shaped like a trapezoid. How many sides are there in the frames altogether?

Answer:

Three picture frames are on a dresser. Two are shaped like squares and the other is shaped like a trapezoid.

4 + 4 + 4 = 12 sides

Thus there are 12 sides in the frame.

**Test Practice**

Question 11.

Mr. Corwin drew four shapes on the whiteboard. Which shape does not appear to have a right angle?

Answer:

Option B does not appear to have a right angle as it is a parallelogram.