Lines of Symmetry
What is a line of symmetry?
A line that divides a shape into two identical parts.
What is the difference between area & perimeter?
Area is the space that is inside a shape. The perimeter is the length that measures the outside.
What is a polygon with 3 sides?
A triangle.
What are 4 different angle names?
Acute, Obtuse, Right, Straight (180), Zero Angle, or 360.
What are parallel lines?
Two lines that never intersect.
Draw a polygon that has 0 lines of symmetry.
Answers vary.
To find the area of a rectangle, what formula do you use?
length x width
List 3 different polygons that have 4 sides.
Rhombus, Square, Triangle, Quadrilateral, Parallelogram, Kite, etc.
Draw an acute, obtuse, right and straight angle.
Check drawings.
What are perpendicular lines?
1
To find the perimeter of a rectangle, what formula do you use?
(2 x width) + (2 x length)
Draw a polygon that is a quadrilateral and has 2 parallel sets of sides.
A rectangle, parallelogram, square, or rhombus.
Use a protractor to draw a 50 degree angle.
Check using a protractor.
Draw perpendicular lines, parallel lines, and intersecting lines.
Check drawings.
Draw a quadrilateral with exactly 2 lines of symmetry.
Example: Rectangle
A rectangle has the dimensions of a 12in by 14in. What is the area?
168 sq. in.
Draw a quadrilateral that has at least 1 obtuse angle.
A trapezoid or parallelogram. Or another shape that has 4 sides and an obtuse angle.
(NOT a rectangle, square, or kite)
You have a right angle. The right angle is broken into 2 smaller angles (parts). One angle measures 30 degrees. What must the other angle measure?
60 degrees because a right angle equals 90 degrees.
Draw a polygon that has at least two sets of perpendicular lines.
Rectangle, square, etc.
How many lines of symmetry does an octagon have?
8
A rectangle has the dimensions of a 10in by 12in. What is the perimeter?
44 in.
What is the difference between scalene, isosceles, and equilateral triangles?
Scalene: All sides are different lengths
Isosceles: Two sides are the same length
Equilateral: All side lengths are equal.
You have a straight angle. The angle is broken into 2 smaller angles (parts). One angle measures 125 degrees. What does the other angle have to measure?
55 degrees because 180 - 125 = 55.
How many sets of parallel lines does a trapezoid have?
1