Question

Fill in the blanks:
$\left(1\right)$ The point of concurrency of the three altitudes of a triangle is called___________.
$\left(2\right)$ The sum of the measures of the angle in a line is __________.
$\left(3\right)$ The second power of any number is _________.

Answer 1

$1)$When the triangle is obtuse, the points of concurrency lie outside the triangle. The common intersection of the three lines containing the altitudes is called the orthocenter of a triangle. The common intersection of the three lines containing the perpendicular bisectors is called the circumcenter of a triangle.

Answer is orthocentre

$2)$is ${180}^{\circ }$

$3)$Its square