By: Katerina Palacios 10-1

2 similar polygons: When 2 polygons are similar that means that they have the same looking shape but they do not have the same size. Some are smaller and some are bigger. But if you know the polygons very well than you can distinguished them better. 6cm 4cm 3cm 1cm 2cm 5cm 8cm 7cm 6cm 5cm

What is a scale factor? A scale factor is a form of describing how the sides of a polygon are different. It can also mean the ratio of the 2 corresponding sides of 2 similar figures. To find the scale factor of a figure, you have to enlarge the figure by using the corresponding ratios. book8/bk8i19/s2eg3.gif

To find the scale factor for perimeter and area of similar figures you have to see which are the corresponding sides and the corresponding angles. The corresponding sides have to be proportional and the corresponding angles have to be congruent or equal to each other. The you just solve like you will solve a scale factor, which I have explained earlier. 4cm 2cm Perimeter: 2/1 Area: (2/1) 2 12cm 4cm Perimeter: 3/1 Area: (3/1) 2 15cm 3cm Perimeter: 5/1 Area: (5/1) 2

What is an angle of elevation? An angle of elevation is an angle that is being formed by a horizontal line and to a line of sight to a point that is above the line We use this angle in real life to calculate how high are things, and in case of airplanes where should they land. What is an angle of depression? The angle of depression is the angle that is being formed by a horizontal line and a line of sight to a point that is below the line. This two angles are practically the same, but one is on top and the other one is on the bottom. But they still relate to each other.

A B Angle of depression Angle of elevation C D Angle of depression Angle of elevation