## anonymous 5 years ago I need help please! with area of triangles

1. anonymous

2. anonymous

3. anonymous

$Area_{\Delta} = \frac{1}{2}Base \times Height$

4. anonymous

i know. but i need help solving a question.!

5. anonymous

im sorry its base.

6. anonymous

7. anonymous

Breadth is a decent word for it

8. anonymous

ok hold on.

9. anonymous

use 1.7 as the value of square root 3. what is the area of equalateral triangle abc in sq. in

10. anonymous

what are the lengths of the sides of the triangle?

11. anonymous

here ill send a picture.

12. anonymous

13. anonymous

Ok, so what is the length of the base?

14. anonymous

I don't know..

15. anonymous

its equilateral

16. anonymous

4?

17. anonymous

yes

18. anonymous

Ok.

19. anonymous

so now we need the height (the length of the blue line through the middle)

20. anonymous

how?

21. anonymous

pythagoras theorem

22. anonymous

Well, we have 2 right triangles described in the middle of that equalateral triangle.

23. anonymous

yes.

24. anonymous

$2^{2} + x ^{2} = 4^{?}$

25. anonymous

so the length of the hypotenuse of either of them is 4. and one leg is 2 (half of 4). What is the length of the other leg?

26. anonymous

its 2?

27. anonymous

$x = \sqrt{4^{2}-2^{?}}$

28. anonymous

which is sqrt of (16 - 4)

29. anonymous

which is sqrt 12.

30. anonymous

since sqrt 3 is given by 1.7

31. anonymous

yes,

32. anonymous

sqrt 12 = sqrt(4x3)

33. anonymous

sqrt(4x3) = 2x(sqrt3)

34. anonymous

which is 2x1.7 = 3.4, therefore the length is 3.4 and the base 4.

35. anonymous

using the formula 1/2 b h = 0.5 x 3.4 x 4.

36. anonymous

37. anonymous

are u sure

38. anonymous

this means you don't understand how it's done!

39. anonymous

the more important question is are YOU sure.

40. anonymous

Because if you aren't sure, then you have no way to know if holy did it right.

41. anonymous

yes.

42. anonymous

NO I UNDERSTAND! :) now.

43. anonymous

can u guys help me with one more like that?

44. anonymous

?

45. anonymous

46. anonymous

its the same question as the previous. if you understood you should be able to do this.

47. anonymous

since its an equilateral triangle. use the formula to get the length of the triangle.

48. anonymous

using the formula $a ^{2} + b ^{2} = c ^{2}$

49. anonymous

you can find out what is the height/length of the triangle.