Triangle

Q. 47. Venn diagram of ((A union b) intersection c) whole complement

Q. 21. If A, B and C are sets and * stands for complementation then {(A B) C}* =

Q. If the ratio of complement of x and supplement of y is 1:2, then the ratio of x and y is what?

Q.

U = set of all triangles
A = set of all equilateral triangles
So,
A^c = ?

1. set of all scalene triangles

2. set of all triangles which are not right triangles

3. A set of all triangles which are not equilateral triangles

4. set of all isosceles triangles

Q. In the diagram below, $A$ and $B(20,0)$ lie on the $x$-axis and $C(0,30)$ lies on the $y$-axis such that $\angle ACB={90}^{\circ }.$ A rectangle $DEFG$ is inscribed in $△ABC.$ Given that the area of $△CGF$ is $351$ sq. units. Then $\frac{1}{9}\left(\text{area of rectangle}DEFG\right)$ is
(correct answer + 3, wrong answer 0)

Q. 39.How to remember trigonometry complementary angles