Given an equilateral triangle with side (a) equal to 15, calculate the other relevant items in this triangle
Calculate Perimeter:
P = 3a P = 3 x 15 P = 45
Calculate Semiperimeter s:
s =
P
2
s =
45
2
s = 22.5
Calculate Area (A):
A =
a2√3
4
A =
152√3
4
A =
225√3
4
A =
389.711431703
4
A = 97.427857925749
Calculate Bisector
ha-ma-ta =
a√3
2
ha-ma-ta =
25.980762113533
2
ha-ma-ta = 12.990381056767
Calc. Circumscribed Circle Radius
R =
a√3
3
R =
25.980762113533
3
R = 8.6602540378444
Calculate Inscribed Circle Radius
r =
a√3
6
r =
25.980762113533
6
r = 4.3301270189222
P = 45 s = 22.5 A = 15
What is the Answer?
P = 45 s = 22.5 A = 15
How does the Equilateral Triangle Calculator work?
Given a side (a), this calculates the following items of the equilateral triangle:
* Perimeter (P)
* Semi-Perimeter (s)
* Area (A)
* altitudes (ha,hb,hc)
* medians (ma,mb,mc)
* angle bisectors (ta,tb,tc)
* Circumscribed Circle Radius (R)
* Inscribed Circle Radius (r) This calculator has 1 input.
What 3 formulas are used for the Equilateral Triangle Calculator?