Drill & Review

These are lines in a plane that are always the same distance apart. They never intersect.

• intersecting lines

• line segment

• parallel lines

• perpendicular lines

These are lines that meet or cross each other in a plane.

• intersecting lines

• line segment

• parallel lines

• perpendicular lines

Which of the following shows right angle?

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Which of the following shows acute angle?

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Which of the following shows obtuse angle?

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I am a 3-sided polygon with congruent sides.

• isosceles triangle

• equilateral triangle

• scalene triangle

Answer explanation

An equilateral triangle is a triangle in which all three sides have the same length.

My 4 sides are equal. All my sides form right angles.

• triangle

• regular quadrilateral

• rhombus

Answer explanation

Square is a quadrilateral with all the sides equal and all angles equal to 90∘.

I have one pair of parallel sides.

• triangle

• quadrilateral

• trapezoid

Answer explanation

A trapezoid has one pair of parallel sides