Another quadrilateral that you might see is called a rhombus. All four sides of a rhombus are congruent. Its properties include that each pair of opposite sides is parallel, also making it a parallelogram. In summary, all squares are rectangles, but not all rectangles are squares.
let's recall that i⁴ = 1 so then 
Answer:
a is <u>5</u><u>3</u><u>.</u><u>8</u><u>°</u><u>,</u> and b is <u>3</u><u>6</u><u>.</u><u>2</u><u>°</u>
Step-by-step explanation:
Using sine trig rule:


Summation of angles of triangle:

Multiply 6 and 8 which is 48cm
The answer is 4/5
its very simple