For the following questions answer them individually
$$\begin{bmatrix}2 & 16 \\-8 & 0 \end{bmatrix} = \begin{bmatrix}a & b^2 \\c^3 & 0 \end{bmatrix}, c < 0, b < 0 \Rightarrow 3a + b + c =$$
In a $$\triangle$$ABC, D, E, F are the mid points of the sides AB, BC and CA respectively. If AB = 8 cm, BC = 15 cm and AC = 12 om, then DE + EF + FD =
A, B, C are three points on the circumference of a circle with centre O. If, in $$\triangle ABC$$. $$\angle B = 60^\circ$$ and $$\angle C = 70^\circ$$, then $$\angle BOC =$$
If P, Q, R, S are the mid points of the sides of a quadrilateral ABCD, then the quadrilateral PQRS is a
The points A(3, -5) and B(-5, 4) are given. If C is a point such that $$\frac{AC}{CB} = 2$$, then the coordinates of C are
A (4, 2), B (6, 5) and C (1, 4) are the vertices of a $$\triangle$$ABC. The median from A meets the side BC at D. Then $$2AD^2 =$$