Warm up Get a piece of paper, compass and straight edge. 1.Create an acute angle. Duplicate it....
14
Warm up Get a piece of paper, compass and straight edge. 1.Create an acute angle. Duplicate it. 2.Create and obtuse angle. Duplicate it. 3.Create another obtuse angle. Bisect it. 4.Create another acute angle. Bisect it. 5.Create segment AB. Construct a perpendicular bisector.
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Transcript of Warm up Get a piece of paper, compass and straight edge. 1.Create an acute angle. Duplicate it....
Warm up
Get a piece of paper, compass and straight edge.
1. Create an acute angle. Duplicate it.
2. Create and obtuse angle. Duplicate it.
3. Create another obtuse angle. Bisect it.
4. Create another acute angle. Bisect it.
5. Create segment AB. Construct a perpendicular bisector.
1.8 Perimeter, Circumference, & Area
♥ Perimeter is the distance around a polygon
♥ Circumference is the distance around a circle.
♥ Area is the number of square units that a shape encloses.
♥ Perimeter is labeled in units
♥ Circumference is labeled in units
♥ Area is labeled in units squared.
Really super duper, extra
double triple, uber
important!!!
TrapezoidA = (b1 + b2)h 2
b1
b2
h
ParallelogramA=bh
b
h
Find the perimeter and area of each figure.
P = 5 + 5 + 9 + 9P = 28 cm
A = 5 * 9P = 45 cm2
P = 7 + 7 + 7 + 7P = 28 cm
A = 7 * 7P = 49 cm2
10 feet
14 feet
7 feet6 feet 6 feet
8 feet
4 feet7 feet
9 feetP = 7 + 7 + 10 + 14P = 38 feet P = 8 + 4 + 7 + 6
P = 25 feetA = (b1 + b2)h 2A = (10 + 14)(6) 2A = (24)(6)/2 = 72 feet2
A = (b1 + b2)h 2A = (6 + 4)(7) 2A = (10)(7)/2 = 35 feet2
Area Addition Postulate
25 sq ft
45 sq ft
13 sq ft
11 sq ft
Total area = 94 sq. ft.
To find the area of the shaded region
1. Find the area of the big shape
2. Find the area of the small shape
3. Subtract them
7 units
10 units
3 units
4 units
Area of large shape = 70 sq unitsArea of small shape = 12 sq unitsArea of shaded region = 58 sq units.
White Board Time
09000 2 87654321510 04 98765432103 9876543210987654321021 987654321098765432100Hours Minutes Seconds
Doodle Time Timer
09000 1 87654321500 04 98765432103 9876543210987654321021 987654321098765432100Hours Minutes Seconds
Insert Text Here
Time’s up!
Erase your
boards.
2
2
14
4 4
38 8
6 2
22 sq units
16
4
28
44 sq units
3 12
32
Find the area and circumference of each circle in terms of π.
A =πr2
A =π (16) 2
A = 256 π units2
A =πr2
A =π (3.9) 2
A = 15.21 π units2
C = 2πrC = 2π(3.9)C = 7.8π units
C = 2πrC = 2 π (16)C = 32 π units
Your assignment
Pg 70; 5-16, 18-21
Pg 75; 5-21, 23-25, 29-32, 33-42
