Chapter 3. 1-7

1. Describes lines
that intersect at 90° 1. Perpendicular

2. Describes lines
in the same plane
that never intersect 2. Parallel

3. A line that divides a
line segment in half
and is at right angles 3. Perpendicular Bisector
(90°) to it

4. A line that divides a
angle into two equal parts 4. Angle Bisector

5. A part of a line between
two endpoints 5. Line Segment












6. Which of the following are parallel
and which are perpendicular?

Parallel lines are lines that never cross or intersect.
Ex:



















Perpendicular lines are lines that intersect at a 90° angle.









7. Copy these line segments into your
notebook. Draw two perpendicular line
segments and two parallel line segments for each

A perpendicular bisector is this:















Hope that you like this and hope you learn more from this.

Question 8-10

For number eight you have to make two different method of perpendiclar bisectors

Method one

1. draw a line segment
2. sharp end of the compass
3. make an arc slightly larger than half the length of theline segment
4. repeat the process from point B with the same sized arc
5. with a ruler join the two arc intersection with a atraight line
6. now you have a perpendicular bisector

Chapter 03 Review 16-17

Area of a triangle

16. What is the area of each triangles?

a.)36m2

b.)b=5.2m,h=5.3m

17. Aleta has a pasture for her horses. The pasture runs alongside a creek as shown.

a.) What is the approximate area of the pasture? Explain how you determined your answer.

b.) Why is the area approximate?

The creek is not in a straight line

Video of Area of a Triangle:

http://www.youtube.com/watch?v=xz6gBA0M9FY

Textbook Answers 1-3

1.

Answer:

The base and the height are the same.


2.

Answer: She used the side not the height.

3.




Answer:
3. A) 3 cm
B) 6cm

Area of a Triangle

Area of a triangle: Is base times height divided by 2.

Here's a picture that can give you an idea what base times height divided by 2 looks like:
















Every triangle is half of a parallelogram. We know the formula to find the area of a parallelogram is base times height. So the formula for the area of a triangle is half the area of a parallelogram. Formula for area of a triangle is base times height divided by 2.

Height of a triangle is a perpendicular line from the base to opposite angle.

Here are some pictures for how it looks like:





















Here is a video you can watch to help you:



The homework for today is in your homework booklet pages 36-37

Hope this helps you! :) Please comment on anything that you liked or things I need to improve on! Thank you.

Text book answers for question 4-6

a.) 4cm²

b.) 9cm²

a.) 20 cm²

b.) 21 cm²

a.) 20 cm²

b.) 21 cm²

Text Book Answers for Number 10-12

10. A parallelogram-shaped stripe is going to be painted on the wall of a daycare centre. There is enough paint to make a stripe with area of 9m². How high can the stripe be?
Answer: The stripe can go up by 6 meters how did i get the answer? i divided 9÷1.5=6 so the height will be 6
here's the formula:
Area of parallelogram
Base×Height=
1.5×6=
9m²



11. a) With a ruler, measure the base and height of this parallelogram. Explain how you measured it.

Answer: Base=2cm, Height=1.5cm. I measured the base with a ruler. Then used a protractor to draw the height perpendicular to the base and measure the height using a ruler.


b) What is the area?

Answer: the area is 3cm² since 2×1.5= 3


c) Use a different side of the parallelogram as the base. Determine the new height and calculate the area. How doe this compare to your answer?

Answer: The answer will be the same.


12. Which of the 2 shapes shown below has a greater area?Explain your answer



Answer: The are is the same because the 2 shapes has the same base and height so if u calculate it with the formula the answer will be 12cm²

Here's a video to help and understand how to do area of parallelogram:




Here's a link to a game