Right triangle calculator (A,c)

You have entered hypotenuse c and angle α.

Right scalene triangle.

Sides: a = 1077.98436400183 b = 479.94992388294 c = 1180

Area: T = 258688.714374868
Perimeter: p = 2737.93328788477
Semiperimeter: s = 1368.96664394239

Angle ∠ A = α = 66° = 1.15219173063 rad
Angle ∠ B = β = 24° = 0.41988790205 rad
Angle ∠ C = γ = 90° = 1.57107963268 rad

Height: h_a = 479.94992388294
Height: h_b = 1077.98436400183
Height: h_c = 438.45554470317

Median: m_a = 721.70987043189
Median: m_b = 1104.37215616179
Median: m_c = 590

Line segment c_a = 195.21329422483
Line segment c_b = 984.78770577517

Inradius: r = 188.96664394239
Circumradius: R = 590

Vertex coordinates: A[1180; 0] B[0; 0] C[984.78770577517; 438.45554470317]
Centroid: CG[721.59656859172; 146.15218156772]
Coordinates of the circumscribed circle: U[590; 0]
Coordinates of the inscribed circle: I[889.01772005944; 188.96664394239]

Exterior (or external, outer) angles of the triangle:
∠ A' = α' = 114° = 1.15219173063 rad
∠ B' = β' = 156° = 0.41988790205 rad
∠ C' = γ' = 90° = 1.57107963268 rad

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How did we calculate this triangle?

The calculation of the triangle has two phases. The first phase calculates all three sides of the triangle from the input parameters. The first phase is different for the different triangles query entered. The second phase calculates other triangle characteristics, such as angles, area, perimeter, heights, the center of gravity, circle radii, etc. Some input data also results in two to three correct triangle solutions (e.g., if the specified triangle area and two sides - typically resulting in both acute and obtuse) triangle).

1. Input data entered: hypotenuse c and angle α

c = 1180 α = 66 °

2. From the angle α, we calculate angle β:

α + β + 90 ° = 180 ° β = 90 ° - α = 90 ° - 66 ° = 24 °

3. From the hypotenuse c and angle α, we calculate cathetus a:

sin α = a : c a = c \cdot sin α = 1180 \cdot sin (66 °) = 1077.984

4. From the cathetus a and hypotenuse c, we calculate cathetus b - Pythagorean theorem:

c^{2} = a^{2} + b^{2} b = c^{2} - a^{2} = 118 0^{2} - 1077.98 4^{2} = 479.949

We know the lengths of all three sides of the triangle, so the triangle is uniquely specified. Next, we calculate another of its characteristics - the same procedure for calculating the triangle from the known three sides SSS.

a = 1077.98 b = 479.95 c = 1180

5. The triangle perimeter is the sum of the lengths of its three sides

6. Semiperimeter of the triangle

The semiperimeter of the triangle is half its perimeter. The semiperimeter frequently appears in formulas for triangles to be given a separate name. By the triangle inequality, the longest side length of a triangle is less than the semiperimeter.

7. The triangle area - from two legs

8. Calculate the heights of the right triangle from its area.

9. Calculation of the inner angles of the triangle - basic use of sine function

sin α = \frac{a}{c} α = arcsin (\frac{a}{c}) = arcsin (\frac{1 0 7 7 . 9 8}{1 1 8 0}) = 66 ° sin β = \frac{b}{c} β = arcsin (\frac{b}{c}) = arcsin (\frac{4 7 9 . 9 5}{1 1 8 0}) = 24 ° γ = 90 °

10. Inradius

An incircle of a triangle is a tangent circle to each side. An incircle center is called an incenter and has a radius named inradius. All triangles have an incenter, and it always lies inside the triangle. The incenter is the intersection of the three-angle bisectors. The product of a triangle's inradius and semiperimeter (half the perimeter) is its area.

11. Circumradius

The circumcircle of a triangle is a circle that passes through all of the triangle's vertices, and the circumradius of a triangle is the radius of the triangle's circumcircle. The circumcenter (center of the circumcircle) is the point where the perpendicular bisectors of a triangle intersect.

R = \frac{c}{2} = \frac{1 1 8 0}{2} = 590

12. Calculation of medians

A median of a triangle is a line segment joining a vertex to the opposite side's midpoint. Every triangle has three medians, and they all intersect each other at the triangle's centroid. The centroid divides each median into parts in the ratio of 2:1, with the centroid being twice as close to the midpoint of a side as it is to the opposite vertex. We use Apollonius's theorem to calculate a median's length from its side's lengths.

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See more information about triangles or more details on solving triangles.