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Quadrilaterals
Interior and Exterior Angles
Area of
Regular Triangles
Area of Regular
Quadrilaterals and Hexagons
Vocab
100
Opposite sides are parallel.
What is a parallelogram?
100
Sum of the internal angles of a triangle.
What is 180°?
100
The area of a triangle with side length 10in.
What is 75/
√
3
in
2
? [43.3]
A=1/2*a*P
a=5/
√
3
P=30
100
Area of a regular quadrilateral with apothem 5cm.
What is 100 cm
2
?
100
A figure with straight sides and a fully enclosed area.
What is a polygon?
200
Opposite sides are parallel and all angles are 90°.
What is a rectangle?
200
The sum of the external angles of any convex polygon.
What is 360°?
200
Area of a triangle with apothem 6cm.
What is 108
√
3
cm
2
? [187.06]
A=1/2*a*P
a=6
P=36
√
3
200
Area of a regular quadrilateral with perimeter 20cm.
What is 25 cm
2
?
200
A polygon with at least one angle bent in toward its center.
What is concave?
300
Exactly one pair of parallel sides.
What is a trapezoid?
300
The measure of each internal angle of an octagon.
What is 135°?
300
Area of a triangle with radius 2m?
What is 3
√
3
m
2
? [5.2]
A=1/2*a*P
a=1
P=6
√
3
300
Area of a regular quadrilateral with radius 3
√
2
in.
What is 36 in
2
?
300
A polygon with nine sides?
What is a nonagon?
400
All sides are congruent.
What is a rhombus?
400
The measure of each external angle of a regular decagon.
What is 36°?
400
Area of a triangle with perimeter 18
√
3
in.
What is 27
√
3
in
2
? [46.77]
A=1/2*a*P
a=3
P=18
√
3
400
The area of a hexagon with apothem 5
√
3
in.
What is 150
√
3
in
2
? [259.81]
A=1/2*a*P
a=5
√
3
P=60
400
The segment from the center of a polygon to the midpoint of a side?
What is the apothem?
500
Exactly one pair of parallel sides; base angles are congruent.
What is an isosceles trapezoid?
500
The measure of each internal angle of a regular 60-gon?
What is 174°?
500
Area of a triangle with apothem 2
√
3
cm.
What is 36
√
3
cm
2
? [62.35]
A=1/2*a*P
a=2
√
3
P=36
500
The area of a hexagon with radius 4cm.
What is 24
√
3
cm
2
? [41.57]
A=1/2*a*P
a=2
√
3
P=24
500
A polygon with n sides.
What is an n-gon?