4th grade geometry

Example

What type of angle is 65°?

1. 65° is acute.

Answer: acute

Example

How many lines of symmetry does a regular pentagon have?

1. A regular pentagon has 5.

Answer: 5

Example

On Fatima's map, two straight roads cross, but not at a right angle. What are such lines called?

1. They are intersecting (not perpendicular).

Answer: intersecting (not perpendicular)

Example

An L-shape is made by cutting a small rectangle, 5 cm by 6 cm, from one corner of a big rectangle, 14 cm by 9 cm. What is the perimeter of the L-shape?

1. Sides: 14, 3, 5, 6, 9, 9
2. 14 + 3 + 5 + 6 + 9 + 9 = 46
3. 46 cm

Answer: 46

Example

Amara covers a rectangular floor 4 m by 6 m with carpet. How many square metres of carpet are needed?

1. 4 × 6 = 24 m²

Answer: 24

Example

What angle, in degrees, is 5/12 of a full turn?

1. 360 ÷ 12 = 30
2. 30 × 5 = 150°

Answer: 150

Example

Angle ABD is 25° and angle DBC is 29°. They sit side by side to make angle ABC. What is angle ABC?

1. 25° + 29° = 54°

Answer: 54

Example

What do we call something that has two endpoints?

1. a line segment

Answer: a line segment

Example

A triangle has angles of 14°, 24°, 142°. What type of triangle is it?

1. Largest angle: 142°
2. obtuse-angled

Answer: obtuse-angled

Example

Which quadrilateral has four right angles but two pairs of different-length sides?

1. rectangle (not a square)

Answer: rectangle (not a square)

Example

Is an equilateral triangle a regular polygon?

1. yes

Answer: yes