Option B. 12ā3
Step-by-step explanation:
Lateral area of the solid figure will be = 3Ć(one lateral side )
Area of a lateral side of the given triangle = (1/2) Ć (height) Ć (Base)
Height of an isosceles triangle with a side 4 will be = ā(4Ā² - 2Ā²) = ā(16-4)= ā12 = 2ā3
Now area of one lateral side = (1/2)Ć(2ā3)Ć(4) = 4ā3
Therefore lateral area of the solid figure = 3Ć(4ā3) = 12ā3