How can I find the area of a triangle with these three given points?

Question

The points are (-1,0) (2,7) and (2,0)

Answer 1

in general you need to find the distance of the points (3 pairs) and apply the formula for area of triangle

in your case, two points lie on x-axis (-1,0) and (2,0) with a distance of 3, so it's much easier that the other point's y-coordinate is the height of the triangle (7) so you can easily apply the formula of 1/2 * base * height

Comments

henry :
your way is tooooooo long.
the area is 1/2 * determinant of the 3 points

A = 1/2 *
-1 2 2
0 7 0
A =| 1/2(-7 -14) | = 10.5

Answer 2

Area of a triangle= 1/2 *b*h

Plot the points and count the distances to find the sides. Plug the numbers in and solve.

Answer 3

A jeweler creates triangular medallions by bending pieces of silver wire. Each medallion is an equilateral triangle. Each side of a triangle is 3cm long. How many medallions can b e made from a piece of wire that is 65 cm long?

Answer 4

you see 2 numbers and you do     base*height

Answer 5

21cm  17cm   10cm

Answer 6

 find the area

Answer 7

what is the area of triangular table having dimensions 17sm and 10cm?

Answer 8

You  can get your answer by always remembering of a coordinataded shape to help me I use khan academy and I also use ixl.com I hope this helped u guys if need help subscribe things and I will make shure to post them on youtube also a lot of the resources are on youtube for your guyses information

Answer 9

its very difficult to answer the question

Answer 10

have s e x with your m o t h e r then drink your own c u m