how to knaw triangle
Answers
I hope its helpful to you
Step-by-step explanation:
Equilateral, Isosceles and Scalene
There are three special names given to triangles that tell how many sides (or angles) are equal.
There can be 3, 2 or no equal sides/angles:
Equilateral Triangle
Equilateral Triangle
Three equal sides
Three equal angles, always 60°
Isosceles Triangle
Isosceles Triangle
Two equal sides
Two equal angles
Scalene Triangle
Scalene Triangle
No equal sides
No equal angles
How to remember? Alphabetically they go 3, 2, none:
Equilateral: "equal"-lateral (lateral means side) so they have all equal sides
Isosceles: means "equal legs", and we have two legs, right? Also iSOSceles has two equal "Sides" joined by an "Odd" side.
Scalene: means "uneven" or "odd", so no equal sides.
What Type of Angle?
Triangles can also have names that tell you what type of angle is inside:
Acute Triangle
Acute Triangle
All angles are less than 90°
Right Triangle
Right Triangle
Has a right angle (90°)
Obtuse Triangle
Obtuse Triangle
Has an angle more than 90°
Combining the Names
Sometimes a triangle will have two names, for example:
Right Isosceles Triangle
Right Isosceles Triangle
Has a right angle (90°), and also two equal angles
Can you guess what the equal angles are?
Play With It ...
Try dragging the points around and make different triangles:
You might also like to play with the Interactive Triangle.
Angles
The three interior angles always add to 180°
Perimeter
The perimeter is the distance around the edge of the triangle: just add up the three sides:
Area
triangle base=b height=h
The area is half of the base times height.
"b" is the distance along the base
"h" is the height (measured at right angles to the base)
Area = ½ × b × h
The formula works for all triangles.
Note: a simpler way of writing the formula is bh/2
Example: What is the area of this triangle?
Triangle height=12, base=20
(Note: 12 is the height, not the length of the left-hand side)
Height = h = 12
Base = b = 20
Area = ½ × b × h = ½ × 20 × 12 = 120
The base can be any side, Just be sure the "height" is measured at right angles to the "base":
(Note: You can also calculate the area)