The area of the triangle formed by the lines $x=0;y=0$ and $x\sin { { 18 }^{ 0 } } +y\cos { { 36 }^{ 0 } } +1=0$ is-

A line L passes through the points $(1,1)$and $(2,0)$ and another line $L^{\prime}$ passes through $\left(\frac{1}{2}, 0\right)$ and perpendicular to L.Then the area of the triangle formed by

the lines $L, L^{\prime}$ and $y-$ axis, is

$\mathrm{A}(\mathrm{a}+1,1), \mathrm{B}(2 \mathrm{a}+1,3), \mathrm{C}(2 \mathrm{a}+2,2 \mathrm{a})$ একটি ত্রিভুজের তিনটি শীর্ষবিন্দু।

$a=3$ হলে, $ABC$ ত্রিভুজের ক্ষেত্রফল কত বর্গ একক?

Let A(-4, 0) & B(4,0). Then the number of points C=(x,y) on the circle ${x^2} + {y^2} = 16$ lying in first quadrant $(x,y \geqslant 0)$ such that the area of the triangle whose vertices are A,B,C is a integer is