∠BAC=90，∠C=30，

∫tanC = ABAC

∴AB=AC？ tanC

= 12×33

=43

≈6.9 meters;

(2) Make an arc with point A as the center and point AB as the radius. When the sunlight is tangent to the arc, the shadow of the tree is the longest.

Point d is the tangent point, and DE⊥AD intersects AC at point e,

In Rt△ADE, ∠ ade = 90, ∠ e = 30,

∴AE=2AD=2×43≈ 13.9 (male). Solution: (1) In Rt△ABC,

∠BAC=90，∠C=30，

∫tanC = ABAC

∴AB=AC？ tanC

= 12×33

=43

≈6.9 meters;

(2) Make an arc with point A as the center and point AB as the radius. When the sunlight is tangent to the arc, the shadow of the tree is the longest.

Point d is the tangent point, and DE⊥AD intersects AC at point e,

In Rt△ADE, ∠ ade = 90, ∠ e = 30,

∴AE=2AD=2×43≈ 13.9 (male).