Triangle and Quadrilateral SMPN 1 Cibinong 7-1 2008-2009

TRIANGLE

Triangle is a certain plane which has three close side

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

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

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)

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

QUADRILATERAL

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

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

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

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)

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)

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

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