1. Triangle and Quadrilateral
SMPN 1 Cibinong
7-1

2. TRIANGLE

3. Triangle is a certain plane which has three close side

4. Parts of Triangle
Vertex
(point , , ,)
Side
(line , , ,)
Angle
( , , )

5. a) Look into length of side
Kinds of Triangle
a) Look into length of side
a.1) Triangle
Scalene Triangle (sembarang)1.1
Isosceles Triangle (sama kaki)1.2
Equilateral Triangle (sama sisi)1.3
1.1
1.2
1.3

6. b) Look into measure of the angle
Kinds of Triangle
b) Look into measure of the angle
Acute triangle
(if all of three sides is < 90⁰)
Right triangle
(if one of three sides = 90⁰)
Obtuse triangle
(if one of three side90⁰ < side < 180⁰)

7. Circumference and Area of Triangle
1.a) Circumference
1.b) Area
Circumference:
side + side + side
Area:
½Base x high

8. QUADRILATERAL

9. Rectangle Circumference: side + side + side Circumference:
2(length + wide)
Circumference:
side + side + side
Wide (w)
Length (l)
Area:
Length x wide

10. Square Circumference: s + s + s + s = 4s Area: side x side Side (s)

11. Parallelogram Circumference: total of sides Area: Base x high side

12. 1/2 diagonal¹ x diagonal²
Rhombus
Area:
1/2 diagonal¹ x diagonal²
Circumference:
s + s + s + s = 4s
Side (s)
Side (s)
diagonal²
diagonal¹
Side (s)
Side (s)

13. 1/2 diagonal¹ x diagonal²
Kite
Circumference:
s + s + s + s
Area:
1/2 diagonal¹ x diagonal²
Side (s)
Side (s)
diagonal¹
diagonal²
Side (s)
Side (s)

14. ½ total parallel side x high
Trapezoid
(side)
Paralel side
side
side
high
Circumference:
s + s + s + s
Paralel side
(side)
Area:
½ total parallel side x high

15. Kinds of Trapezoid Isosceles trapezoid (trapesium sama kaki)1.1
Right trapezoid (trapesium siku - siku)1.2
Scalence trapezoid (trapesium sembarang)1.3
1.1
1.2
1.3