Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
Zion made a triangular-shaped house of cards with the base having a measurement of 40 centimeters and a height of 20 centimeters. If two of his friends also built similar shaped houses, what's the total area of the triangular houses that Zion and his friends made (the area of a triangle is 1/2 * width * height)?

### Response:
 Kwa kuwa eneo la pembetatu linafanywa na 1/2 msingi * urefu, eneo la nyumba ya kadi yenye umbo la pembetatu ambayo Zion alijenga ni 1/2 * 40 * 20 = <<1/2*40*20=400>>400 sentimita za mraba.
Ikiwa marafiki zake wawili pia walijenga nyumba zenye umbo sawa, eneo jumla la nyumba zao za pembetatu za kadi ni 400+400=<<400+400=800>>800 sentimita za mraba.
Pamoja na Zion, wote walijenga nyumba za pembetatu za kadi zenye eneo la jumla la 800+400=<<800+400=1200>>1200 sentimita za mraba.