2D Geometry

CRM 3.3 Test Review!

• 6.GR.2.1: Derive a formula for the area of a right triangle using a rectangle. Apply a formula to find the area of a triangle.

• 6.GR.2.2: Solve mathematical and real-world problems involving the area of quadrilaterals and composite figures by decomposing them into triangles or rectangles.

LET'S REVIEW SOME IMPORTANT INFO!

Drag and Drop

A composite figure is a two- or three- dimensional figure that can be ​

Placeholder

into smaller figures.

Drag these tiles and drop them in the correct blank above

decomposed

composed

Multiple Choice

To decompose a shape in math is to...

• break it down into parts.

• multiply all the sides.

• subtract.

• find the area.

Draw

Decompose this figure!

(HINT: There are two OR three shapes here)

Multiple Choice

What does area mean?

• the distance around a shape

• half the distance around a shape

• the amount of space outside a shape

• the amount of space inside a shape

Multiple Choice

Which is the correct area formula for Triangles?

Multiple Choice

Which is the correct area formula for Rectangles?

Multiple Choice

What does the b stand for?

• bottom

• base

• bread

• funny bone

Multiple Choice

What does the h stand for?

• hairy

• area

• height

• hen

Drag and Drop

The base of a triangle and the height MUST be ​

Placeholder

to each other. ( $$90\degree$$ )

Drag these tiles and drop them in the correct blank above

perpendicular

parallel

intersecting

Draw

Circle the BASE of this rectangle.

Draw

Circle the HEIGHT of this rectangle.

Multiple Choice

What is the area of this rectangle?

• 20 $$units^2$$

• 9 $$units^2$$

• 10 $$units^2$$

• 24 $$units^2$$

Draw

Circle the BASE of this triangle.

Draw

Circle the HEIGHT of this triangle.

Multiple Choice

What is the area of this triangle?

• 20 $$units^2$$

• 9 $$units^2$$

• 10 $$units^2$$

• 24 $$units^2$$

Draw

Circle the BASE of this triangle.

Draw

Circle the HEIGHT of this triangle.

Multiple Choice

Find the area of the following triangle.

(HINT: find your formula, find its parts, plug it in!)

BE CAREFUL WITH YOUR HEIGHT!!

• 53.4375 $$cm^2$$

• 243.2 $$cm^2$$

• 106.875 $$cm^2$$

• 121.6 $$cm^2$$

LET'S PRACTICE FR FR!!

Multiple Choice

The composite shape shown has an area of 132 $$cm^2$$ . What is the length of the missing measurement labeled p?

• 5 cm

• 8 cm

• 10 cm

• 7 cm

Multiple Choice

Find the area of the triangle.

(HINT: find your formula, find its parts, plug it in!)

• 59.5 $$in^2$$

• 119 $$in^2$$

• 22.5 $$in^2$$

• 56 $$in^2$$

Draw

Decompose the shape to find the area.

FIRST: DECOMPOSE THE SHAPE!

(HINT: you only need to draw 1 line)

Multiple Choice

Decompose the shape to find the area.

NOW: Find the area.

(HINT: find area of each rectangle, then add those areas together)

• 44 $$m^2$$

• 32 $$m^2$$

• 12 $$m^2$$

• 44 $$m^{ }$$

Multiple Choice

What is the area of the figure shown below?

(HINT: follow the steps we have been practicing during this review)

• 154 $$yd^2$$

• 196 $$yd^2$$

• 46.5 $$yd^2$$

• 196 yd