In the grid of dots above, each dot has equal vertical & horizontal spacing from the others. A small 45-45-90 triangle

This topic has expert replies
Moderator
Posts: 7187
Joined: Thu Sep 07, 2017 4:43 pm
Followed by:23 members

Timer

00:00

Your Answer

A

B

C

D

E

Global Stats

half-square grid of dots with triangle.JPG
In the grid of dots above, each dot has equal vertical & horizontal spacing from the others. A small 45-45-90 triangle is drawn. Counting this triangle, how many triangles congruent to this one, of any orientation, can be constructed from dots in this grid?
A. 112
B. 120
C. 240
D. 448
E. 480


OA B

Source: Magoosh
Source: — Problem Solving |