Math Is Fun Forum
You are not logged in.
- Topics: Active | Unanswered
Pages: 1
#1 2017-07-13 14:23:34
- Bhavya2
- Guest
Area of triangle
In right triangle BAC , A is a right angle. AD is perpendicular to BC.
If BD = 9 cm and DC = 4 cm , can you find the area of triangle ABC.
If yes what is the area
If no why can't we find it out?
#2 2017-07-13 15:59:18
- Monox D. I-Fly
- Member
- From: Indonesia
- Registered: 2015-12-02
- Posts: 2,000
Re: Area of triangle
The area is 39 cm² because AD is 6 cm.
Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away.
May his adventurous soul rest in peace at heaven.
Offline
#3 2017-07-13 19:20:52
- Bob
- Administrator
- Registered: 2010-06-20
- Posts: 10,640
Re: Area of triangle
hi Bhavya2
Welcome to the forum.
I have deleted my answer because it was wrong. Monox D. I-Fly has the right result.
Bob
Children are not defined by school ...........The Fonz
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you! …………….Bob 
Offline
#4 2017-07-13 21:02:23
- Monox D. I-Fly
- Member
- From: Indonesia
- Registered: 2015-12-02
- Posts: 2,000
Re: Area of triangle
Monox D. I-Fly: Where did you get 6 from?
Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away.
May his adventurous soul rest in peace at heaven.
Offline
#5 2017-07-13 22:04:40
- Bob
- Administrator
- Registered: 2010-06-20
- Posts: 10,640
Re: Area of triangle
hi Monox D. I-Fly
Thanks for the explanation. My answer is completely wrong so I have deleted it. Whoops. 
Bob
Children are not defined by school ...........The Fonz
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you! …………….Bob
Offline
#6 2017-07-14 02:52:14
- Monox D. I-Fly
- Member
- From: Indonesia
- Registered: 2015-12-02
- Posts: 2,000
Re: Area of triangle
You are welcome.
Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away.
May his adventurous soul rest in peace at heaven.
Offline
#7 2017-07-15 19:24:51
- Bob
- Administrator
- Registered: 2010-06-20
- Posts: 10,640
Re: Area of triangle
hi NakulG
19.5? What, the area? I think not.
The area is 39 cm² because AD is 6 cm.
This is correct. half base times height = 0.5 x (9+4) x 6 = 13 x 3 = 39.
Bob
Children are not defined by school ...........The Fonz
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you! …………….Bob
Offline
Pages: 1