Use this isosceles triangle calculator to calculate isosceles triangle height, area, or missing sides.
h = height
A = area
a = equal side
b = base
| Base (b) | Side (a) | Height (h) | Area |
|---|---|---|---|
| 4 | 5 | 4.583000 | 9.166667 |
| 6 | 5 | 3.000000 | 9.000000 |
| 8 | 10 | 7.746000 | 30.984000 |
| 10 | 13 | 9.748000 | 48.740000 |
| 12 | 15 | 11.180000 | 67.080000 |
To manually calculate isosceles triangle height and area:
1. Use h = √(a² − (b² / 4)) to find the height.
2. Use A = (b × h) / 2 to find the area.
This isosceles triangle calculator instantly computes height and area with six-decimal precision using the isosceles triangle height formula.
• The two equal sides are opposite the equal angles.
• The vertex angle is opposite the base.
• Height, median, and bisector from vertex are equal.
• Isosceles triangles are common in architecture.
• They have a line of symmetry along the height.