📐
Area of Triangle
★★☆☆☆Middle School
📖Definition
The area of a triangle is half the product of its base and height.
📐Formulas
A = (1)/(2) × b × h
Basic formula: base × height ÷ 2
- AArea of the triangle
- bLength of the base
- hHeight perpendicular to the base
A = (1)/(2)absin C
Formula using two sides and included angle
- a, bLengths of two sides
- CAngle between the two sides
A = √s(s-a)(s-b)(s-c)
Heron's formula (s = (a+b+c)/2)
✏️Examples
예제 1★☆☆☆☆
Find the area of a triangle with base 6cm and height 4cm.
A = (1)/(2) × 6 × 4 = 12cm²
예제 2★★★☆☆
Find the area of a triangle with sides 5cm and 8cm, and included angle 30°.
A = (1)/(2) × 5 × 8 × sin 30° = 10cm²
🔗Related Documents
→Prerequisites
←Next Topics
↔Related
⚡Applications
#geometry#triangle#area#fundamental