Please help round to the nearest tenth

a = 4.6

b = 4.2

Step-by-step explanation:

to find a, use cos:

⇒ cos =

⇒ cos 30 =

cos of 30 is 0.154

⇒ 0.154 =

multiply 13 on both sides:

⇒ 0.154 x 13 = x 13

⇒ 4.62 = a

round to the nearest tenth:

⇒ 4.62 = 4.6

⇒ a = 4.6

to find b, use tan:

⇒ tan =

⇒ tan 60 =

tan of 60 is 0.320

⇒ 0.320 =

multiply 13 on both sides:

⇒ 0.320 x 13 = x 13

⇒ 4.16 = b

round to the nearest tenth:

⇒ 4.16 = 4.2

⇒ b = 4.2

pentagon

step-by-step explanation:

the coordinates   a(5, -2), b(3,-1),c(-4,-4) d(-3,8) and e(-1,4) forms the vertices of the polygon when they are connected in order.

in order to classify that which polygon is it with the given coordinates, first count the number of vertices and then count the number of sides it can make with these vertices.

since, the given coordinates have five vertices, therefore, it will make five sides. moreover, pentagon is regular in nature therefore it will be convex.

now, a polygon with five sides is known as pentagon, therefore, the given polygon is the pentagon.