define acute angled and obtuse angled triangles. Let’s draw the triangles and measure

If vec xa n d vec y are two non-collinear vectors and A B C isa triangle with side lengths a ,b ,a n dc satisfying (20 a-15 b) vec x+(15b-12 c) vec y+(12 c-20 a)( vecx xx vec y)=0, then triangle A B C is a. an acute-angled triangle b. an obtuse-angled triangle c. a right-angled triangle d. an isosceles triangle

If vec xa n d vec y are two non-collinear vectors and a, b, and c represent the sides of a A B C satisfying (a-b) vec x+(b-c) vec y+(c-a)( vec x xx vec y)=0, then A B C is (where vec xxx vec y is perpendicular to the plane of xa n dy ) a. an acute-angled triangle b. an obtuse-angled triangle c. a right-angled triangle d. a scalene triangle

One of the acute angle of a right angled triangle is 30^@ . Find the other two angle in circular measure.

If the difference of two acute angles of a right angled triangle of a right angled triangle is 18^@ , find in circular measure the angle of the triangle .

Draw a triangle ABC and measure its sides.

By giving a counter example, show that the following statements are not true. If all the angles of a triangle are equal, then the triangle is an obtuse angled triangle.

The difference of two acute angle of a right angled triangle is 50^g . If the value of the least acute angle be (npi)/4 then the value of n will be

The points (0,8/3),(1,3) and (82 ,30) are the vertices of (A) an obtuse-angled triangle (B) an acute-angled triangle (C) a right-angled triangle (D) none of these

Prove that the statement "If all the the angles of a triangle are equal , then the triangle is an obtuse angled triangle " is false .