Here is a tunnel for a toy train. Work out the total area of
all six faces of the tunnel.
Give your answer in terms of t.
+
The diagram below shows the
cross section of the tunnel.
8 cm
АЧ B
с
2 cm
2 cm
10 cm
AD is a semicircular arc of radius 10 cm
BC is a semicircular arc of radius 8 cm
The length of the tunnel is 30 cm
Total marks: 5

proofs involving isosceles triangles often require special consideration because an isosceles triangle has several distinct properties that do not apply to normal triangles.(more about triangle types) therefore, when you are trying to prove that two triangles are congruent, and one or both triangles, are isosceles you have a few theorems that you can use to make your life easier.

step-by-step explanation:

an isosceles triangle has two congruent sides and two congruent angles. the congruent angles are called the base angles and the other angle is known as the vertex angle. ∠bac and ∠bca are the base angles of the triangle picture on the left. the vertex angle is ∠abc

it would open into a square depending on the type of envelope i’m not sure about the second part

answer:   (s+1)(s+4)

step-by-step explanation:

factor s2+5s+4

s2+5s+4

=(s+1)(s+4)

step-by-step explanation: