If side of an equilateral triangle is 20 cm, then find its altitude ?

Asked by nisha_vini29 | 21st May, 2017, 11:36: PM

Expert Answer:

 
begin mathsize 14px style Side space of space straight a space triangle equals AB equals BC equals CA equals 20 space cm
rightwards double arrow BD equals 10 space cm
By space Pythagoras space theorem comma
AD squared equals AB squared minus BD squared
rightwards double arrow AD squared equals 20 squared minus 10 squared equals 400 minus 100 equals 300
rightwards double arrow AD equals 10 square root of 3 space cm
end style

Answered by Rashmi Khot | 22nd May, 2017, 09:46: AM