Geometry Point Line Line segment Ray Plane Parallel lines Intersecting lines Angles

.A Geometry Point Line Line segment An exact location in space An endless collection of points along a straight path Line segment Part of a line that has two endpoints .A

Geometry Ray Part of a line that has one endpoint and extends endlessly in the other direction Plane An endless, flat surface that is named by any three points not on the same line. .A .C .B

Geometry Parallel Lines Intersecting Lines Perpendicular Lines Lines that do not intersect Intersecting Lines Lines meet at one point Perpendicular Lines Lines form a right angle

Angles An angle is formed when two rays have the same endpoint. This endpoint is called the vertex. The two rays that form the angle are called sides.

Angles There are four types of angles Right angle Straight angle Acute angle Obtuse angle

Right Angles Forms a square corner Forms a 90 degree angle. Use a corner of your index card to make sure you a have a right angle 90 degrees

Straight Angle Forms a straight line Angle is 180 degrees Use the edge of your index card to make sure you have a straight angle. 180 degrees

Acute Angles Forms an angle that is less than a right angle Angle is less than 90 degrees

Obtuse Angles Form an angle that is more than a right angle Angle is more than 90 degrees

Review Name each picture Ray Parallel lines Line 1. 2. 3.

Review Name each picture Acute angle Line segment Point 4. 5. 6.

Review Name each picture Intersecting lines Perpendicular and Intersecting lines

Area and Perimeter

Area is the amount of surface space that a flat object has. Area is reported in the amount of square units.

Would the area of your bedroom or the area of your house be greater? When you measure the amount of carpet to cover the floor of a room, you measure it in square units. ? Would the area of your bedroom or the area of your house be greater? ? You’re right! The area of your house is greater than the area of your bedroom.

Count the number of squares. Lets find the area of this surface if each square is equal to one foot. Count the number of squares. 1 2 Area = 15 square feet 3 4 5 6 7 8 9 10 11 12 13 14 15

The area is equal to 9 square units. Try this one! Count the number of green squares to determine the area of this surface. What is the area? 1 2 3 4 5 6 7 8 9 The area is equal to 9 square units.

Perimeter Perimeter is the distance around the outside edge of a flat object. Perimeter is reported as a total number of linear units.

When you measure the amount of wallpaper border to go around a room, you measure it in lengths. ? Would the perimeter of your bedroom or the perimeter of your house be greater? ? You’re right! The perimeter of your house is greater than the perimeter of your bedroom.

Count the number of sides. Let’s find the perimeter of this surface if each square is equal to one foot. Count the number of sides. Perimeter = 24 feet

The perimeter is equal to 12. Try this one! Count the number of sides to determine the perimeter of this flat object. The perimeter is equal to 12.

Let’s do these problems together. Two neighbors build swimming pools. This is what the pools look like. Which family has the pool with the bigger swimming area? Family B Family A

The area of Family A’s pool is? 8 square units. The area of Family B’s pool is? 7 square units Therefore, Family A has the pool with the bigger swimming area. Family B Family A

Now look at those same two pools Now look at those same two pools. Which family has more side panels of the pool to clean? The perimeter of Family A’s pool is 12 units long. The perimeter of Family B’s pool is 14 units long. Therefore, Family B has more side panels of the pool to clean. Family B Family A

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