The diagram shows a prism with a rectangular base, ABFE. The cross-section, ABCD, is a trapezium with AD = BC. AB = 8cm, GH = 5 cm, BF = 12 cm and angle ABC = 70°. (a) Calculate the total surface area of the prism.​

c. 27 units.

step-by-step explanation:

we are told that in circle a, ∠bae ≅ ∠dae.

we can see from our given diagram that in and ;

, as these are radii of our given circle.

therefore, by sas congruence postulate.

hence, side be will be equal to side de as corresponding parts of congruent triangles are congruent. so we can set an equation to find the value of x as:

now let us substitute x=17 in the expression for the length of be.

therefore, length of be will be 27 units and option c is the correct choice.

other answer is correct. i had used the radius of the radius somehow. a website:

sorry

step-by-step explanation:

sorry, but im pretty sure its a now that i look at it

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