If he goes to bed at 9:00 pm, and wakes up at 10:00 am he will have slept 13 hours.
Whats the choices?..............................................................................
Answer:
20√3 cm
Step-by-step explanation:
Altitude of an equilateral triangle splits it into 2 equal right triangles, it bisects the base and the angle opposite to the base.
<u>Let the altitude be x. Then as per Pythagorean theorem:</u>
- x² = 40² - (40/2)²
- x²= 1600 -400
- x²= 1200
- x= √1200
- x= 20√3 cm
<u>Correct choice is</u> the second one
See https://web2.0calc.com/questions/need-help-now_10.
