
True or False: Two parallel lines intersect.
Solution
False: Two parallel lines do not intersect.

A triangle is a closed planar shape with
Solution
3 sides. (tri in the word triangle means three, from Latin)

A closed planar shape with 5 sides is called a
Solution
pentagon. (penta in the word pentagon means five, from Greek)

A closed planar shape with 4 sides is called a
Solution
quadrilateral. (quadri in the word quadrilateral means four, from Latin)

A line segment is defined by
Solution
2 points

An equilateral triangle has
Solution
all three sides equal and all three angles equal.

Which of the statements below best describes a square?
Solution
A square has 4 equal sides and 4 right angles.

Which pair of lines are parallel?
Solution
The pair of lines in A are parallel because they do not intersect.

Which of these shapes are
 quadrilaterals?
 triangles?

squares?
Solution
i) quadrilaterals have 4 sides: shapes B, E F.
ii) triangles have 3 sides: shapes A, D.
iii) squares have 4 equal sides and 4 right angles: shape F.

Which of these shapes are
 right triangles?

rectangles?
Solution
i) right triangles have 1 right angle: shape B.
ii) rectangles have 2 pairs of parallel sides and 4 right angles: shapes D and E.

Which pair of lines are
 parallel?

perpendicular?
Solution
i) parallel lines do not intersect. Lines S and R are parallel
ii) perpendicular lines intersect and form a right angle (90 degrees). T and S , and T and R are pairs of perpendicular lines.

Find the perimeter and area of each shape.
Solution
Shape A
Perimeter = 5 + 5 + 5 + 5 = 20
Area = 5 × 5 = 25
Shape B
Perimeter = 9 + 6 + 9 + 6 = 30
Area = 9 × 6 = 54
Shape C
Perimeter = 10 + 2 + 10 + 2 = 24
Area = 10 × 2 = 20
Shape D
Perimeter = 5 + 4 + 5 + 4 = 18
Area = 5 × 4 = 20

Find the perimeter and area of each shape.
Solution
Shape A: Perimeter is obtained by adding all sides. Starting from the top side we have
Perimeter = 4 + 4 + 4 + 4 + 8 + 8 = 32
Shape A: The area of the given shape is equal to the area of the square of side 8 from which the area of the small square top right of side 4 is subtracted.
Area = 8 × 8  4 × 4 = 64  16 = 48
Shape B: Perimeter is obtained by adding all sides. Starting from the top side we have
Perimeter = 8 + 2 + 4 + 4 + 4 + 2 + 8 + 8 = 40
Shape B: The area of the given shape is equal to the area of the square (left side) of side 8 to which the area of the small square (right side) of side 4 is added.
Area = 8 × 8 + 4 × 4 = 64 + 16 = 80

Which of these is an isosceles triangle?
Solution
An isosceles triangle has two equal sides: shape B

Which pair of triangles are congruent?
Solution
Congruent shapes have sides of equal length: shapes A and C

Point O is the center of the circle below. What do you call the segments
 AB?
 CD?

OD?
Solution
A segment whose endpoints are on a circle is called a chord: AB is a chord
A chord that passes through the center of circle is called a diameter: CD is a diameter
A segment whose 2 endpoints are: 1) the center of circle and 2) one point on the circle is called the radius: OD is a radius
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