| |
|
|
| |
 |
| Hero's Formula |
|
|
| |
 |
| |
 |
| |
| Fig (i) Fig (ii) |
| |
 |
| |
| Fig (iii) |
| |
| Let D = area of triangle |
| |
| From figure (i), C < 90o (C is acute) and AD ^ BC. |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
| From figure (ii), C > 90o (C is obtuse) and AD ^ BC produced. |
| |
 |
| |
 |
| |
 |
| |
 |
| |
| From figure (iii), C = 90o. |
| |
 |
| |
 |
| |
 |
| |
| Alternate form |
| |
 |
| |
 |
| |
 |
| |
 |
| |
| Note: |
| |
| Slight manipulation of half anlge formulae lead to the following results. |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
|
|
| |
|
|
| |
|
|
|
|
|
Get FREE Live Tutoring
(No credit card required)
Customer Care
Click to get customer service, technical support and subscription help.
Refer-A-Friend
Get One Month Free!
When you refer a friend
|
|
|
